Segment Reporting [Abstract] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Segments [Axis] Segments [Axis] Segments [Domain] Segments [Domain] Astro Scientific Astro Scientific [Member] Astro Scientific [Member] Astral Astral Images, Inc [Member] Astral Images, Inc [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Revenue Revenues Depreciation Depreciation, Depletion and Amortization Loss before Income Taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Fixed Assets, Net Property, Plant and Equipment, Net Total Capital Expenditures Capital Expenditure Capital Expenditure Total Assets Assets Risks and Uncertainties [Abstract] Concentration Risk [Table] Concentration Risk [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Unrealized Loss in Mutual Fund Investments Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Revenue Sales Revenue, Net [Member] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Customer concentration risk Customer Concentration Risk [Member] Concentration Risk [Line Items] Concentration Risk [Line Items] Current period change in other comprehensive loss before reclassifications Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Noncontrolling Interest [Abstract] Noncontrolling Interest [Table] Noncontrolling Interest [Table] Astrotech Corp Stockholders' Equity Parent [Member] Noncontrolling Interest in Subsidiary Noncontrolling Interest [Member] Noncontrolling Interest [Line Items] Noncontrolling Interest [Line Items] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Balance, beginning of period Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Stock based compensation Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Share repurchases Treasury Stock, Value, Acquired, Cost Method Net change in available-for-sale securities Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Net loss attributable to Astrotech Corporation Net Income (Loss) Attributable to Parent Net loss attributable to noncontrolling interest Net Income (Loss) Attributable to Noncontrolling Interest Balance, end of period Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Schedule of stock option activity Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block] Schedule of stock options by exercise price Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] Schedule of restricted stock activity Schedule of Unvested Restricted Stock Units Roll Forward [Table Text Block] Statement of Financial Position [Abstract] Preferred stock, par value (in dollars per share) Preferred Stock, No Par Value Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Preferred stock, shares issued (in shares) Preferred Stock, Shares Issued Preferred stock, shares outstanding (in shares) Preferred Stock, Shares Outstanding Common stock, par value (in dollars per share) Common Stock, No Par Value Common stock, shares authorized (in shares) Common Stock, Shares Authorized Common stock, shares outstanding (in shares) Common Stock, Shares, Outstanding Common stock, shares issued (in shares) Common Stock, Shares, Issued Treasury stock, shares at cost (in shares) Treasury Stock, Shares Equity [Abstract] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] Reclassification to net loss for realized losses Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Organization, Consolidation and Presentation of Financial Statements [Abstract] General Information Business Description and Basis of Presentation [Text Block] Investments, Debt and Equity Securities [Abstract] Investment [Table] Investment [Table] Investment Type [Axis] Investment Type [Axis] Investments [Domain] Investments [Domain] Mutual Funds - Corporate & Government Debt Mutual Funds [Member] Represents mutual funds. Fixed Income Bonds Fixed Income Investments [Member] Time Deposits Bank Time Deposits [Member] Investment [Line Items] Investment [Line Items] Available-for-sale securities: Available-for-sale Securities [Abstract] Adjusted Cost Available-for-sale Securities, Amortized Cost Basis Unrealized Gain Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax Unrealized Loss Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax Fair Value Available-for-sale Securities Held-to-maturity Securities [Abstract] Held-to-maturity Securities [Abstract] Held-to-maturity securities Held-to-maturity Securities Unrealized Gain Held-to-maturity Securities, Accumulated Unrecognized Holding Gain Unrealized Loss Held-to-maturity Securities, Accumulated Unrecognized Holding Loss Fair Value Held-to-maturity Securities, Fair Value Revenue Recognition [Abstract] Revenue Recognition Revenue Recognition [Text Block] The entire disclosure for revenue recognition. If the entity has different policies for different types of revenue transactions, the policy for each material type of transaction is generally disclosed. If a sales transaction has multiple element arrangements (for example, delivery of multiple products, services or the rights to use assets) the disclosure may indicate the accounting policy for each unit of accounting as well as how units of accounting are determined and valued. The disclosure may encompass important judgment as to appropriateness of principles related to recognition of revenue. The disclosure also may indicate the entity's treatment of any unearned or deferred revenue that arises from the transaction. Revenue Recognition, Multiple-deliverable Arrangements [Table] Revenue Recognition, Multiple-deliverable Arrangements [Table] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Revenue Recognition, Multiple-deliverable Arrangements [Line Items] Revenue Recognition, Multiple-deliverable Arrangements [Line Items] Fixed price subcontract on government project, term Revenue Recognition, Fixed Price Subcontract On Government Project, Term Revenue Recognition, Fixed Price Subcontract On Government Project, Term Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Our Business Units Segment Reporting, Policy [Policy Text Block] Inventory Disclosure [Abstract] Inventory valuation reserves Inventory Valuation Reserves Raw materials Inventory, Raw Materials, Net of Reserves Work in process Inventory, Work in Process, Net of Reserves Finished goods Inventory, Finished Goods, Net of Reserves Total inventory Inventory, Net Fair Value Disclosures [Abstract] Schedule of fair value of financial instruments Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] Common Stock Incentive, Stock Purchase Plans and Other Compensation Plans Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Assets Assets [Abstract] Current assets Assets, Current [Abstract] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Short-term investments Short-term Investments Accounts receivable, net of allowance Accounts Receivable, Net, Current Costs and estimated revenues in excess of billings Costs in Excess of Billings, Current Inventory, net Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Total current assets Assets, Current Property and equipment, net Long-term investments Long-term Investments Total assets Liabilities and stockholders’ equity Liabilities and Equity [Abstract] Current liabilities Liabilities, Current [Abstract] Accounts payable Accounts Payable, Current Accrued liabilities and other Accrued Liabilities, Current Income tax payable Taxes Payable, Current Total current liabilities Liabilities, Current Other liabilities Other Liabilities, Noncurrent Total liabilities Liabilities Commitments and contingencies (Note 12) Commitments and Contingencies Stockholders’ equity Stockholders' Equity Attributable to Parent [Abstract] Preferred stock, no par value, convertible, 2,500,000 shares authorized; no shares issued and outstanding, at March 31, 2017 and June 30, 2016 Preferred Stock, Value, Issued Common stock, no par value, 75,000,000 shares authorized; 22,555,247 and 21,811,153 shares issued at March 31, 2017 and June 30, 2016, respectively; 20,577,356 and 20,627,511 shares outstanding at March 31, 2017 and June 30, 2016, respectively Common Stock, Value, Issued Treasury stock, 1,977,891 and 1,183,642 shares at cost at March 31, 2017 and June 30, 2016, respectively Treasury Stock, Value Additional paid-in capital Additional Paid in Capital Accumulated deficit Retained Earnings (Accumulated Deficit) Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Equity attributable to stockholders of Astrotech Corporation Stockholders' Equity Attributable to Parent Noncontrolling interest Stockholders' Equity Attributable to Noncontrolling Interest Total stockholders’ equity Total liabilities and stockholders’ equity Liabilities and Equity Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] Securities Repurchase Program Securities Repurchase Program [Member] Securities Repurchase Program [Member] Award Type [Axis] Award Type [Axis] Equity Award [Domain] Equity Award [Domain] Employee Stock Option Employee Stock Option [Member] Restricted Stock Restricted Stock [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Aggregate intrinsic value of options exercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Remaining share-based compensation expense Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options Weighted average recognition period on remaining share-based compensation expense Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Compensation costs recognized related to stock options Allocated Share-based Compensation Expense Remaining share-based compensation expense Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options Common stock repurchase - authorized amount Stock Repurchase Program, Authorized Amount Share repurchases (in shares) Treasury Stock, Shares, Acquired Common stock repurchased - value Share repurchased, average cost (in dollars per share) Treasury Stock Acquired, Average Cost Per Share Income Statement [Abstract] Revenue Cost of revenue Cost of Revenue Gross profit (loss) Gross Profit Operating expenses: Operating Expenses [Abstract] Selling, general and administrative Selling, General and Administrative Expense Research and development Research and Development Expense Total operating expenses Operating Expenses Loss from operations Operating Income (Loss) Interest and other expense, net Nonoperating Income (Expense) Loss before income taxes Income tax (expense) benefit Income Tax Expense (Benefit) Net loss Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Less: Net loss attributable to noncontrolling interest Net loss attributable to Astrotech Corporation Weighted average common shares outstanding: Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract] Basic and Diluted (in shares) Weighted Average Number of Shares Outstanding, Basic and Diluted Basic and diluted net loss per common share: Earnings Per Share, Basic and Diluted [Abstract] Net loss attributable to Astrotech Corporation (in dollars per share) Earnings Per Share, Basic and Diluted Other comprehensive loss, net of tax: Other Comprehensive Income (Loss), Net of Tax [Abstract] Available-for-sale securities: Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent [Abstract] Net unrealized gain (loss) Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax Reclassification adjustment for realized losses Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, Net of Tax Total comprehensive loss Comprehensive Income (Loss), Net of Tax, Attributable to Parent Income Tax Disclosure [Abstract] Income Taxes Income Tax Disclosure [Text Block] Schedule of concentrations of sales and accounts receivable Schedules of Concentration of Risk, by Risk Factor [Table Text Block] Noncontrolling Interest Noncontrolling Interest Disclosure [Text Block] Schedule of noncontrolling interest Redeemable Noncontrolling Interest [Table Text Block] Schedule of changes in stockholders equity Schedule of Stockholders Equity [Table Text Block] Schedule of available-for-sale securities Available-for-sale Securities [Table Text Block] Schedule of held-to-maturity securities Held-to-maturity Securities [Table Text Block] Earnings Per Share [Abstract] Numerator: Income Amounts Attributable to Parent, Disclosures [Abstract] Amounts attributable to Astrotech Corporation, basic and diluted: Amounts Attributable To Parent Basic And Diluted [Abstract] Loss before income taxes Income tax (expense) benefit Net loss Denominator: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Denominator for basic and diluted net loss per share attributable to Astrotech Corporation — weighted average common stock outstanding (in shares) Basic and diluted net loss per common share: Earnings Per Share, Basic [Abstract] Shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Outstanding, beginning of period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Exercised (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Canceled or expired (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period Outstanding, end of period (in shares) Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Outstanding weighted average exercise price, beginning of period (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Granted weighted average exercise price (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Exercised weighted average exercise price (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Canceled or expired weighted average exercise price (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price Outstanding weighted average exercise price, end of period (in dollars per share) Net Loss per Share Earnings Per Share [Text Block] Fair Value Measurement Fair Value Disclosures [Text Block] Schedule of inventory Schedule of Inventory, Current [Table Text Block] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] ASTC Contribution Parent Company [Member] Minority Owner Contribution Subsidiaries [Member] Contributions made Noncontrolling Interest, Increase from Subsidiary Equity Issuance Ownership percentage Noncontrolling Interest, Ownership Percentage by Parent Customer [Axis] Customer [Axis] Customer [Domain] Customer [Domain] Next Generation Chemical Detector Partner NGCD Partner [Member] NGCD Partner [Member] Department of Homeland Security Science and Technology Directorate Partner DHS S&T Partner [Member] DHS S&T Partner [Member] A Japanese Aerospace Company A Japanese Aerospace Company [Member] A Japanese Aerospace Company [Member] Accounts receivable Accounts Receivable [Member] Concentration risk, percentage Concentration Risk, Percentage Schedule of Held-to-maturity Securities [Table] Schedule of Held-to-maturity Securities [Table] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Short-Term Investments Short-term Investments [Member] Long-Term Investments Long Term Investments [Member] Long Term Investments [Member] Schedule of Held-to-maturity Securities [Line Items] Schedule of Held-to-maturity Securities [Line Items] Available-for-sale securities, current Held-to-maturity securities, maturities from 1-90 days Held-To-Maturity Securities, Debt Maturities, 1 To 90 Days, Net Carrying Amount Held-To-Maturity Securities, Debt Maturities, 1 To 90 Days, Net Carrying Amount Held-to-maturity securities, maturities from 91-360 days Held-To-Maturity Securities, Debt Maturities, 91 To 360 Days, Net Carrying Amount Held-To-Maturity Securities, Debt Maturities, 91 To 360 Days, Net Carrying Amount Held-to-maturity securities, maturities less than 1 year Held-to-maturity Securities, Debt Maturities, within One Year, Net Carrying Amount Total available-for-sale and held-to-maturity securities Available-for-sale Securities and Held-to-maturity Securities Held-to-maturity securities, maturities over 360 days Held-To-Maturity Securities, Debt Maturities, Over 360 Days, Net Carrying Amount Held-To-Maturity Securities, Debt Maturities, Over 360 Days, Net Carrying Amount Held-to-maturity securities, remaining maturities from 1-3 years Held-to-maturity Securities, Debt Maturities, after One Through Three Years, Net Carrying Amount Held-to-maturity Securities, Debt Maturities, after One Through Three Years, Net Carrying Amount Effective tax rate for continuing operations Effective Income Tax Rate Reconciliation, Percent Federal statutory effective tax rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Unrecognized tax benefits Unrecognized Tax Benefits, Period Increase (Decrease) Inventory Inventory Disclosure [Text Block] Counterparty Name [Axis] Counterparty Name [Axis] Counterparty Name [Domain] Counterparty Name [Domain] Astral Images, Inc Schedule of accumulated other comprehensive loss Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Schedule of earnings per share basic and diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Statement of Cash Flows [Abstract] Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Adjustments to reconcile net loss from operations to net cash used in operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Stock-based compensation Share-based Compensation Amortization Amortization Depreciation Depreciation Net loss on sale of available-for-sale investments Available-for-sale Securities, Gross Realized Gain (Loss), Excluding Other than Temporary Impairments Changes in assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Accounts receivable Increase (Decrease) in Accounts Receivable Cost, estimated earnings and billings, net on uncompleted contracts Increase (Decrease) in Cost in Excess of Billing on Uncompleted Contract Accounts payable Increase (Decrease) in Accounts Payable Other assets and liabilities Increase (Decrease) in Other Operating Assets and Liabilities, Net Income taxes payable Increase (Decrease) in Income Taxes Net cash used in operating activities Net Cash Provided by (Used in) Operating Activities Cash flows from investing activities: Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract] Sale of available-for-sale investments Proceeds from Sale of Available-for-sale Securities Maturities of held-to-maturity securities Proceeds from Maturities, Prepayments and Calls of Held-to-maturity Securities Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment Net cash provided by investing activities-continuing operations Net Cash Provided by (Used in) Investing Activities, Continuing Operations Net cash provided by investing activities-discontinued operations Cash Provided by (Used in) Investing Activities, Discontinued Operations Net cash provided by investing activities Net Cash Provided by (Used in) Investing Activities Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract] Payments for purchase of treasury stock Payments for Repurchase of Equity Proceeds from issuance of common stock Proceeds from Issuance of Common Stock Net cash used in financing activities Net Cash Provided by (Used in) Financing Activities Net change in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Supplemental disclosures of cash flow information: Supplemental Cash Flow Information [Abstract] Cash paid for interest Interest Paid Income taxes paid Income Taxes Paid Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value Measurements Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Fair Value Inputs Level 1 Fair Value, Inputs, Level 1 [Member] Fair Value Inputs Level 2 Fair Value, Inputs, Level 2 [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Mutual funds Mutual Funds Carrying Value This element represents the carrying value of the mutual funds. Mutual funds, fair value Mutual Funds Fair Value This element represents amount of fair value for mutual funds. Held-to-maturity securities, maturities less than 1 year, fair value Held-to-maturity Securities, Debt Maturities, Next Twelve Months, Fair Value Held-to-maturity securities, remaining maturities from 1-3 years, fair value Held-to-maturity Securities, Debt Maturities, after One Through Three Years, Fair Value Held-to-maturity Securities, Debt Maturities, after One Through Three Years, Fair Value Held-to-maturity securities, maturities from 1-90 days, fair value Held-To-Maturity Securities, Debt Maturities, 1 To 90 Days, Fair Value Held-To-Maturity Securities, Debt Maturities, 1 To 90 Days, Fair Value Held-to-maturity securities, maturities from 91-360 days, fair value Held-To-Maturity Securities, Debt Maturities, 91 To 360 Days, Fair Value Held-To-Maturity Securities, Debt Maturities, 91 To 360 Days, Fair Value Held-to-maturity securities, maturities over 360 days, fair value Held-To-Maturity Securities, Debt Maturities, Over 360 Days, Fair Value Held-To-Maturity Securities, Debt Maturities, Over 360 Days, Fair Value Investments Investments Investments, fair value Investments, Fair Value Disclosure Number of reportable segments Number of Reportable Segments Business Risk and Credit Risk Concentration Involving Cash Concentration Risk Disclosure [Text Block] Other Comprehensive Loss Comprehensive Income (Loss) Note [Text Block] Options to purchase shares (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Exercise price lower range (in dollars per share) Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit Exercise price upper range (in dollars per share) Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit Document And Entity Information [Abstract] Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Trading Symbol Trading Symbol Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Document Type Document Type Document Period End Date Document Period End Date Amendment Flag Amendment Flag Document Fiscal Period Focus Document Fiscal Period Focus Document Fiscal Year Focus Document Fiscal Year Focus Schedule of segment reporting information by segment Schedule of Segment Reporting Information, by Segment [Table Text Block] Segment Information Segment Reporting Disclosure [Text Block] Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table] Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table] Exercise Price Range [Axis] Exercise Price Range [Axis] Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Domain] Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Domain] $0.32 – 0.71 Exercise Price Range One [Member] Exercise Price Range One $1.20 – 1.67 Exercise Price Range Two [Member] Exercise Price Range Two $3.20 – 3.20 Exercise Price Range Three [Member] Exercise Price Range Three Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] Number outstanding (in shares) Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options Options Outstanding Weighted- Average Remaining Contractual Life Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term Weighted average exercise price (in dollars per share) Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price Number exercisable (in shares) Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Exercisable Options Options exercisable weighted average exercise price (in dollars per share) Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Exercise Price Investments Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Outstanding, beginning of period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Canceled or expired (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Outstanding, end of period (in shares) Weighted Average Grant-Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Outstanding, beginning of period (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Granted (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Vested (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Canceled or expired (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Outstanding, end of period (in dollars per share)