Document And Entity Information Note To Financial Statement Details Textual Significant Accounting Policies Share-Based Payment Arrangement, Option, Exercise Price Range [Table Text Block] Note 1 - General Information Note 2 - Investments astc_PolicyTable Note 3 - Leases Note 4 - Property and Equipment, Net Note 5 - Intangible Assets, Net Note 7 - Stockholders' Equity Lessee, Operating and Finance Leases Disclosure [Text Block] The entire disclosure for operating and finance leases of lessee. Note 8 - Net Loss Per Share Note 10 - Fair Value Measurement Income Tax Disclosure [Text Block] Note 12 - Stock-based Compensation Note 1 - General Information - Revenue by Geographic Area (Details) Net unrealized gain (loss) Net change in available-for-sale marketable securities Note 1 - General Information - Revenue by Product (Details) Note 2 - Investments - Schedule of Investments (Details) Note 3 - Leases - Schedule of Balance Sheet Presentation of Operating and Finance Leases (Details) us-gaap_LiabilitiesCurrent Total current liabilities Note 3 - Leases - Schedule of Future Minimum Lease Payments (Details) Note 3 - Leases - Schedule of Other Information (Details) Austin, Texas [Member] Information related to Austin, Texas. Note 4 - Property and Equipment - Schedule of Property and Equipment (Details) Note 5 - Intangible Assets, Net - Schedule of Indefinite-Lived Intangible Assets (Details) Available-for-sale securities: Note 7 - Stockholders' Equity - Schedule of Warrant Activity (Details) Note 8 - Net Loss Per Share - Schedule of Basic and Diluted Earnings Per Share (Details) Note 10 - Fair Value Measurement - Schedule of Fair Value Measurement of Financial Instruments (Details) Note 12 - Stock-based Compensation - Stock Option Activity Summary (Details) astc_OperatingAndFinanceLeasesOperatingRightofuseAssets Total lease assets Amount of the lessee's operating and finance lease, operating right-of-use assets. Note 12 - Stock-based Compensation - Stock Options Outstanding (Details) Assets: Lessee's operating and finance lease, right-of-use assets. Note 12 - Stock-based Compensation - Restricted Stock Activity (Details) Liabilities: Lessee's operating and finance lease, liabilities. Notes To Financial Statements astc_OperatingAndFinanceLeasesLiabilities Total lease liabilities Amount of the lessee's operating and finance lease liabilities. Notes To Financial Statements [Abstract] Research And Development Facility [Member] Represents lease for a research and development facility. Share-Based Payment Arrangement, Option, Activity [Table Text Block] Lessee, Operating and Financing Leases, Liability, Maturity [Table Text Block] Tabular disclosure of undiscounted cash flows of lessee's operating and finance lease liabilities. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position. us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue Granted, weighted average grant date fair value (in dollars per share) us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue Vested, weighted average grant date fair value (in dollars per share) us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue Canceled or expired (in dollars per share) us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue Outstanding, weighted average grant date fair value (in dollars per share) us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod Canceled or expired (in shares) Schedule of Balance Sheet Presentation of Operating and Finance Leases [Table Text Block] Tabular disclosure of the balance sheet presentation of the operating and finance leases. us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber Outstanding (in shares) 2027 Amount of lessee's undiscounted obligation for lease payment for operating and finance leases to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). 2028 Amount of lessee's undiscounted obligation for lease payment for operating and finance leases to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod Granted (in shares) us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod Vested (in shares) 2029 Amount of lessee's undiscounted obligation for lease payment for operating and finance leases to be paid in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] astc_LesseeOperatingAndFinanceLeaseLiabilitiesUndiscountedExcessAmount Less: imputed interest Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments for operating and finance leases. astc_LesseeOperatingAndFinanceLeasesLiabilities Present value of net minimum lease obligations Present value of lessee's discounted obligation for lease payments from operating and finance leases. 2030 Amount of lessee's undiscounted obligation for lease payment for operating and finance leases to be paid in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1 Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Intrinsic Value astc_LesseeOperatingAndFinanceLeaseLiabilityPaymentsDue Total lease obligations Amount of lessee's undiscounted obligation for lease payment for operating and finance leases. Furniture, Fixtures, Equipment, and Leasehold Improvements [Member] Represents furniture, fixtures, equipment & leasehold improvements. Warrants exercised (in shares) Number of warrants or rights exercised in period. Grant [Member] Warrants issued (in shares) Number of warrants or rights issued. Lessee, Operating and Finance Leases, Weighted Average Lease Term And Discount Rate [Table Text Block] Tabular disclosure for lessee's operating and finance leases weighted average lease term and discount rate. Outstanding, Aggregate Fair Market Value Represents the aggregate fair market value of outstanding warrants or rights. Warrants issued, Aggregate Fair Market Value The weighted average fair value for warrants or rights issued during the period. Warrants exercised, Aggregate Fair Market Value The weighted average fair value for warrants or rights exercised during the period. us-gaap_PaymentsForProceedsFromShortTermInvestments Proceeds from short-term investments Warrants expired (in shares) Number of warrants or rights which expired during the period. Warrants issued, Weighted Average Exercise Price (in dollars per share) Exercise price per share or per unit of warrants or rights issued. Warrants exercised, Weighted Average Exercise Price (in dollars per share) Exercise price per share or per unit of warrants or rights exercised. Warrants expired,Weighted Average Exercise Price (in dollars per share) Exercise price per share or per unit of warrants or rights expired in period. Financial Instruments [Domain] us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice Outstanding, weighted average grant date fair value (in dollars per share) Outstanding, weighted average grant date fair value (in dollars per share) Warrants expired, Aggregate Fair Market Value The weighted average fair value for warrants or rights expired during the period. Outstanding, Weighted Average Remaining Contractual Term (Year) Weighted average remaining contractual term of outstanding warrants or rights. Canceled or expired, weighted average grant date fair value (in dollars per share) Financial Instrument [Axis] Granted, weighted average grant date fair value (in dollars per share) Exercised, weighted average grant date fair value (in dollars per share) Payroll related accruals Accounts payable us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber Outstanding (in shares) Outstanding (in shares) us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod Canceled or expired (in shares) Non-cash financing activities: Finance lease expenditures incurred but not paid for as of the end of the period astc_NumberOfCustomers Number Of Customers Represents the number of customers. us-gaap_PolicyTextBlockAbstract Accounting Policies us-gaap_PaymentsToAcquireIntangibleAssets Purchases of intangible assets us-gaap_PaymentsToAcquirePropertyPlantAndEquipment Purchases of property and equipment Exercise Price Range 1 [Member] Represents exercise range 1. Exercise Price Range 2 [Member] Represents exercise price range 2. Weighted average common shares outstanding: Current liabilities Donley Facilities [Member] The Donley Facilities. Exercise Price Range 3 [Member] Represents exercise price range 3. us-gaap_IncreaseDecreaseInOperatingLeaseLiability Operating lease liabilities Exercise Price Range 4 [Member] Represents exercise range 4. us-gaap_Assets Total assets Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Plan Name [Axis] Plan Name [Domain] Metric Facility [Member] The metric facility. us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1 Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) Investment [Text Block] Share-Based Payment Arrangement [Text Block] Business Description and Basis of Presentation [Text Block] Award Type [Domain] Effective Income Tax Rate Reconciliation [Table] Award Type [Axis] Net loss Net loss Net loss Accumulated amortization Intangible asset, net Intangible Assets, net Restricted Stock [Member] Share-Based Payment Arrangement, Option [Member] Antidilutive Security, Excluded EPS Calculation [Table] Antidilutive Securities [Axis] Antidilutive Securities, Name [Domain] Loss Contingencies [Table] Indefinite-life intangible asset Commitments and Contingencies Disclosure [Text Block] us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment Accumulated depreciation and amortization Property and equipment, net Property and equipment, net Property Plant And Equipment, Gross Warranty [Member] Relating to warranty. Training [Member] Relating to training. Two Material Customers [Member] Relating to two material customers. Cash flows from investing activities: Debt Securities, Available-for-sale Debt Securities, Available-for-sale, Fair Value us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet Other assets and liabilities Basic and diluted net loss per common share: Earnings Per Share [Text Block] Income tax payable us-gaap_IncreaseDecreaseInAccountsPayable Accounts payable us-gaap_OperatingExpenses Total operating expenses Cash and cash equivalents us-gaap_AllocatedShareBasedCompensationExpense Share-Based Payment Arrangement, Expense Amendment Flag Other comprehensive loss, net of tax: us-gaap_ComprehensiveIncomeNetOfTax Total comprehensive loss City Area Code New Accounting Pronouncements, Policy [Policy Text Block] us-gaap_SharesOutstanding Balance (in shares) Balance (in shares) Common stock, shares outstanding (in shares) Common Stock, Shares, Outstanding (in shares) Preferred stock, shares outstanding (in shares) Current Fiscal Year End Date Operating leases Document Fiscal Period Focus Document Fiscal Year Focus Consolidation, Policy [Policy Text Block] Document Period End Date Operating leases (Year) Entity File Number Entity Emerging Growth Company Document Type Entity Small Business Entity Shell Company Document Information [Line Items] Document Information [Table] Service [Member] us-gaap_AreaOfRealEstateProperty Area of Real Estate Property (Square Foot) Entity Filer Category Entity Current Reporting Status Short-Term Investments [Member] us-gaap_IncreaseDecreaseInAccountsReceivable Accounts receivable Entity Tax Identification Number Entity Central Index Key us-gaap_DepreciationAndAmortization Depreciation, Depletion and Amortization, Nonproduction Entity Registrant Name Entity [Domain] Customer Concentration Risk [Member] Legal Entity [Axis] Entity Address, Address Line One ecd_NonRule10b51ArrTrmntdFlag Non-Rule 10b5-1 Arrangement Terminated [Flag] Entity Address, City or Town ecd_Rule10b51ArrTrmntdFlag Rule 10b5-1 Arrangement Terminated [Flag] ecd_Rule10b51ArrAdoptedFlag Rule 10b5-1 Arrangement Adopted [Flag] Entity Address, Postal Zip Code Supplemental disclosures of cash flow information: us-gaap_TreasuryStockCommonValue Treasury shares, 10,316 at September 30, 2025, and June 30, 2025, respectively Entity Address, State or Province Concentration Risk Type [Axis] ecd_NonRule10b51ArrAdoptedFlag Non-Rule 10b5-1 Arrangement Adopted [Flag] Concentration Risk Type [Domain] Material Terms of Trading Arrangement [Text Block] Entity Common Stock, Shares Outstanding Trading Arrangements, by Individual [Table] Accounts Receivable [Member] astc_OperatingLeaseMonthlyRent Operating Lease, Monthly Rent Amount of monthly rent under operating lease. us-gaap_IncreaseDecreaseInInventories Inventory, net Trading Symbol Concentration Risk Benchmark [Axis] Investment Holdings [Table] Concentration Risk Benchmark [Domain] Local Phone Number Exercised (in shares) us-gaap_TableTextBlock Notes Tables us-gaap_GainLossOnDispositionOfAssets1 Loss on disposal of asset Common Stock Outstanding [Member] Represents common stock outstanding. Stock-based compensation (in shares) Selling, general and administrative Stock-based compensation us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross Granted (in shares) us-gaap_StockIssuedDuringPeriodSharesNewIssues Stock Issued During Period, Shares, New Issues (in shares) Raw materials us-gaap_LiabilitiesAndStockholdersEquity Total liabilities and stockholders’ equity us-gaap_CashUninsuredAmount Cash, Uninsured Amount Finished goods Work-in-process Reported Value Measurement [Member] UNITED STATES us-gaap_IncreaseDecreaseInContractWithCustomerAsset Contract asset Research and development Accumulated deficit Accumulated other comprehensive loss Changes in assets and liabilities: us-gaap_DisclosureTextBlockAbstract Notes to Financial Statements us-gaap_OperatingLeaseLiabilityNoncurrent Operating lease obligations 2031 Amount of lessee's undiscounted obligation for lease payment for operating and finance leases to be paid in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). Thereafter Amount of lessee's undiscounted obligation for lease payment for operating and finance leases due after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). Corporate & Government Debt Mutual Funds Securities [Member] Represents Corporate & Government Debt Mutual Funds Securities. Corporate & Government Debt ETFs Securities [Member] Represents Corporate & Government Debt ETFs Securities. us-gaap_OperatingLeaseLiability Present value of net minimum lease obligations, Operating Leases Subsequent Event [Table] Operating lease obligations Less: lease liabilities - current, Operating Leases Financing lease obligations Less: lease liabilities - current, Finance Leases us-gaap_FinanceLeaseLiabilityNoncurrent Financing lease obligations Subsequent Events [Text Block] Operating lease assets us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue Lessee, Operating Lease, Liability, to be Paid Total lease obligations, Operating Leases us-gaap_FinanceLeasePrincipalPayments Finance Lease, Principal Payments Repayments on finance lease liabilities us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount Less: imputed interest, Operating Leases us-gaap_FinanceLeaseLiability Present value of net minimum lease obligations, Financing Leases 2029, Operating Leases 2030, Operating Leases Financing lease assets 2031, Operating Leases Thereafter, Operating Leases 2027, Operating Leases Debt Securities, Available-for-Sale [Table Text Block] 2028, Operating Leases Segment Reporting, Policy [Policy Text Block] us-gaap_ShareBasedCompensation Stock-based compensation Other assets, net Operating expenses: Intangible Asset, Finite-Lived [Table] us-gaap_LesseeOperatingLeaseTermOfContract Lessee, Operating Lease, Term of Contract (Month) Financial instrument, long-term investments Depreciation and amortization Intangible Assets Disclosure [Text Block] us-gaap_AssetsCurrent Total current assets Equity [Text Block] Fair Value Measurement Inputs and Valuation Techniques [Table] Treasury stock, shares (in shares) Treasury Stock, Common, Shares (in shares) Common stock, $0.001 par value, 250,000,000 shares authorized at September 30, 2025, and June 30, 2025, respectively; 1,769,269 shares issued at September 30, 2025, and June 30, 2025, respectively; 1,758,953 and 1,701,729 shares outstanding at September 30, 2025, and June 30, 2025, respectively Adjustments to reconcile net loss to net cash used in operating activities: Common stock, shares authorized (in shares) Common stock, shares issued (in shares) Common Stock, Shares, Issued (in shares) Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] Common stock, par value (in dollars per share) Lessee, Lease, Description [Table] us-gaap_OperatingLeasePayments Operating Lease, Payments Product and Service [Axis] Product and Service [Domain] Contract Asset Convertible preferred stock, $0.001 par value, 2,500,000 shares authorized; 280,898 shares of Series D issued and outstanding at September 30, 2025, and June 30, 2025 Preferred stock, shares issued (in shares) Preferred Stock, Shares Issued (in shares) Cash paid for interest Income taxes paid Geographical [Axis] Property, Plant and Equipment Disclosure [Text Block] Geographical [Domain] Property, Plant and Equipment [Table Text Block] Preferred stock, shares authorized (in shares) Subleased Facility [Member] Represents the subleased facility. Portion at Fair Value Measurement [Member] Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share (in dollars per share) Estimate of Fair Value Measurement [Member] Revenue Revenue Revenue from Contract with Customer, Including Assessed Tax Measurement Basis [Axis] Fair Value, Inputs, Level 3 [Member] Fair Value Hierarchy and NAV [Domain] Customer [Axis] Customer [Domain] Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, Level 2 [Member] Fair Value Hierarchy and NAV [Axis] Software and Software Development Costs [Member] Inventory, net: Construction in Progress [Member] Cash flows from operating activities: Statement [Line Items] Accounts receivable Additional paid-in capital Accrued expenses and other liabilities, net of current portion Noncurrent portion of amount of expenses incurred but not yet paid nor invoiced, and liabilities classified as other. AOCI Attributable to Parent [Member] Short-term investments Stockholders’ equity Product Warranty Liability [Table] Financial instrument, short-term investments Property, Plant and Equipment [Table] Long-Lived Tangible Asset [Axis] Other income and expense, net Long-Lived Tangible Asset [Domain] Product Warranty Disclosure [Text Block] Current assets Fair Value Disclosures [Text Block] us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect Net change in cash and cash equivalents us-gaap_NetCashProvidedByUsedInFinancingActivities Net cash used in financing activities us-gaap_Liabilities Total liabilities Commitments and contingencies (Note 14) us-gaap_OperatingIncomeLoss Loss from operations us-gaap_NetCashProvidedByUsedInOperatingActivities Net cash used in operating activities us-gaap_NetCashProvidedByUsedInInvestingActivities Net cash provided by investing activities Prepaid expenses and other current assets Cost of revenue us-gaap_GrossProfit Gross profit Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block] Operating Right of Use assets Represents the amount of operating right-of-use interest reported under non-cash financing activities. us-gaap_ProductWarrantyAccrual Standard and Extended Product Warranty Accrual Retained Earnings [Member] Treasury Stock, Common [Member] Additional Paid-in Capital [Member] Preferred Stock [Member] Equity Components [Axis] Equity Component [Domain] Stock, Class of Stock [Table] us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) Warrants Outstanding, Weighted Average Exercise Price (in dollars per share) Warrants Outstanding, Weighted Average Exercise Price (in dollars per share) us-gaap_ClassOfWarrantOrRightOutstanding Outstanding (in shares) Outstanding (in shares) us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) astc_LesseeOperatingLeasesTenantAllowance Lessee, Operating Leases, Tenant Allowance Represents the amount of tenant allowance for an operating lease. Three Material Customers [Member] Three Material Customers Lease liabilities, net of current portion Lease liabilities - non-current Present value of lessee's discounted obligation for lease payments from operating and finance lease, classified as noncurrent. Disaggregation of Revenue [Table Text Block] Disaggregation of Revenue [Table] Lease liabilities, current Less: lease liabilities - current Present value of lessee's discounted obligation for lease payments from operating and finance leases, classified as current. Revenue from Contract with Customer [Text Block] Statement of Financial Position Location, Balance [Axis] Statement of Financial Position Location, Balance [Domain] Document Quarterly Report Entity Incorporation, State or Country Code us-gaap_UnrecognizedTaxBenefits Unrecognized Tax Benefits Accounting Policies [Abstract] Document Transition Report Concentration Risk Disclosure [Text Block] Entity Interactive Data Current Concentration Risk [Table] Security Exchange Name Title of 12(b) Security Exercise Price Range 5 [Member] Represents exercise price range 5. Accrued expenses and other liabilities astc_IncreaseDecreaseInFinancingLiabilityInConnectionWithInternaluseSoftwareFinancingActivities Repayment of financing liability in connection with internal-use software Represents the increase or decrease from the repayment of financing liabilities in connection with internal-use software presented under financing activities. astc_IncreaseDecreaseInFinancingLiabilityInConnectionWithInternaluseSoftwareOperatingActivities Repayment of financing liability in connection with internal-use software Represents the increase or decrease from the repayment of financing liabilities in connection with internal-use software presented in operating activities. us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) Non-US [Member] Statement [Table] Statement of Financial Position [Abstract] Basic and diluted (in shares) Denominator for basic and diluted net loss per share — weighted average common stock outstanding (in shares) us-gaap_EffectiveIncomeTaxRateContinuingOperations Effective Income Tax Rate Reconciliation, Percent Net loss per common share (in dollars per share) Net loss per common share (in dollars per share) Statement of Cash Flows [Abstract] Statement of Stockholders' Equity [Abstract] Income Statement [Abstract] Revenue from External Customers by Geographic Areas [Table Text Block] Interest on financing leases us-gaap_FinanceLeaseLiabilityPaymentsDue Total lease obligations, Financing Leases us-gaap_FinanceLeaseRightOfUseAssetAmortization Finance Lease, Right-of-Use Asset, Amortization 2031, Financing Leases Thereafter, Financing Leases us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount Less: imputed interest, Financing Leases 2027, Financing Leases 2028, Financing Leases 2029, Financing Leases 2030, Financing Leases Accounting Standards Update and Change in Accounting Principle [Table] Schedule of Intangible Assets and Goodwill [Table Text Block] Financing leases Financing leases (Year) Cash flows from financing activities: us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Rights Plan [Member] Relating to the Rights Plan. Series D Preferred Stock [Member] Amortization of operating lease right-of-use assets us-gaap_StockholdersEquity Total stockholders’ equity Balance Balance Class of Stock [Axis] Class of Stock [Domain] Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1 Outstanding, Weighted Average Exercise Price (in dollars per share) us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax Debt Securities, Available-for-sale, Unrealized Loss Options Outstanding, Weighted average remaining contractual life (Year) Debt Securities, Available-for-sale, Unrealized Gain Shares Exercisable (in shares) Exercisable, Weighted Average Exercise Price (in dollars per share) Outstanding, exercise prices range upper (in dollars per share) Share-Based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit (in dollars per share) Number outstanding (in shares) Debt Securities, Available-for-sale, Adjusted Cost Exercise Price Range [Axis] Exercise Price Range [Domain] Outstanding, exercise prices range lower limit (in dollars per share) Share-Based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit (in dollars per share)