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 - Organization and Significant Accounting Policies
Provision at the U.S. federal statutory rate
Note 2 - Revenue Recognition
Note 3 - Income Taxes
Note 7 - Warrants
Note 8 - Stock-based Compensation
Note 10 - Leases
Note 12 - Business Segment and Geographic Financial Data
Note 13 - Restructuring Activities
Income Tax Disclosure [Text Block]
Note 14 - Accrued Liabilities
Note 1 - Organization and Significant Accounting Policies - Reconciliation of Cash, Cash Equivalents, and Restricted Cash (Details)
Amortized cost
Amortized cost
Note 1 - Organization and Significant Accounting Policies - Amortized Cost to Fair Value of HTM Debt Securities (Details)
Note 1 - Organization and Significant Accounting Policies - Debt Securities by Maturity (Details)
Note 1 - Organization and Significant Accounting Policies - Allowance for Doubtful Accounts (Details)
us-gaap_LiabilitiesCurrent
Total current liabilities
Note 1 - Organization and Significant Accounting Policies - Accumulated Other Comprehensive Income (Details)
Note 1 - Organization and Significant Accounting Policies - Summary of Intangible Asset Activity (Details)
Note 1 - Organization and Significant Accounting Policies - Estimated Future Amortization Expense (Details)
Note 1 - Organization and Significant Accounting Policies - Property and Equipment (Details)
Note 1 - Organization and Significant Accounting Policies - Summary of Earnings (Loss) Per Share (Details)
Note 2 - Revenue Recognition - Revenues Disaggregated by Product Technology (Details)
Note 2 - Revenue Recognition - Revenues Disaggregated by Geography (Details)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value
Note 2 - Revenue Recognition - Timing of Revenue Recognition (Details)
Note 2 - Revenue Recognition - Components of Accounts Receivable (Details)
Note 3 - Income Taxes - Components of Income (Loss) Domestic and Foreign (Details)
Note 3 - Income Taxes - Components of Income Tax Expense (Details)
Note 3 - Income Taxes - Income Tax Rate Reconciliation (Details)
Note 3 - Income Taxes - Summary of Deferred Tax Assets and Liabilities (Details)
Note 3 - Income Taxes - Valuation Allowances (Details)
Share-Based Payment Arrangement, Option, Activity [Table Text Block]
Note 3 - Income Taxes - Unrecognized Tax Benefit (Details)
Note 3 - Income Taxes - Cash Taxes Paid (Details)
Note 7 - Warrants - Warrant Activity (Details)
Granted, unvested restricted stock units, weighted average grant date fair value (in dollars per share)
Vested, restricted stock units, weighted average grant date fair value (in dollars per share)
Note 7 - Warrants - Summary of Warrants Outstanding and Exercisable (Details)
Forfeited, restricted stock units, weighted average grant date fair value (in dollars per share)
Note 8 - Stock-based Compensation - Stock-based Compensation (Details)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
Balance, unvested restricted stock units, weighted average grant date fair value (in dollars per share)
Balance, unvested restricted stock units, weighted average grant date fair value (in dollars per share)
Note 8 - Stock-based Compensation - Stock Option Activity (Details)
Note 8 - Stock-based Compensation - Summary of Outstanding Stock Options by Exercise Price Range (Details)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
Forfeited, restricted stock units, shares (in shares)
Note 8 - Stock-based Compensation - Restricted Stock Activity (Details)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
Balance, unvested restricted stock units, shares (in shares)
Balance, unvested restricted stock units, shares (in shares)
Note 10 - Leases - Operating Lease Expense (Details)
Foreign currency translation adjustments
Note 10 - Leases - Remaining Maturities of Existing Lease Liabilities (Details)
Maturities of debt securities
Note 10 - Leases - Lease Liabilities (Details)
Note 10 - Leases - Supplemental Cash Flow Information (Details)
Granted, unvested restricted stock units, shares (in shares)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)
Note 12 - Business Segment and Geographic Financial Data - Reporting Segment Net Sales and Gross Margin (Details)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)
Note 12 - Business Segment and Geographic Financial Data - Geographic Segment Financial Data (Details)
Note 13 - Restructuring Activities - Charges and Net Assets (Details)
Note 14 - Accrued Liabilities - Components of Other Accrued Liabilities (Details)
Notes To Financial Statements
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
Notes To Financial Statements [Abstract]
us-gaap_OtherComprehensiveIncomeLossNetOfTax
Total other comprehensive income (loss)
Exercisable, option, weighted average exercise price (in dollars per share)
Weighted-Average Remaining Contractual Life (years) (Year)
Aggregate Intrinsic Value
ftek_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisesInPeriodShares
Vested, shares (in shares)
The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.
Exercisable, options (in shares)
us-gaap_PaymentsToAcquireHeldToMaturitySecurities
Purchases of debt securities
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Balance, option, weighted average exercise price (in dollars per share)
Balance, option, weighted average exercise price (in dollars per share)
Contract liabilities (Note 2)
us-gaap_ContractWithCustomerLiabilityCurrent
Contract with Customer, Liability, Current
Expired or forfeited, option, weighted average exercise price (in dollars per share)
Employee compensation
Lessee, Operating Leases [Text Block]
Accounts payable
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares)
Balance, number of options outstanding (in shares)
Balance, number of options outstanding (in shares)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod
Expired or forfeited, options (in shares)
Credit Facility [Axis]
Credit Facility [Domain]
Other accrued liabilities
Total other accrued liabilities
us-gaap_PolicyTextBlockAbstract
Accounting Policies
Warranty reserve (Note 9)
us-gaap_PaymentsToAcquireProductiveAssets
Payments to Acquire Productive Assets
Purchases of equipment, patents, and other intangible assets
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)
Accrued professional fees
us-gaap_AccruedProfessionalFeesCurrent
Other Intangible Assets [Member]
Unexercised options and unvested restricted stock units (in shares)
Conversion of unsecured loan notes (in shares)
Accrued liabilities:
us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)
Weighted-average number of common shares outstanding:
Accounts Payable, Accrued Liabilities, and Other Liabilities Disclosure, Current [Text Block]
Cash income taxes paid, net
Total
us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage
Share-Based Payment Arrangement, Tranche Three [Member]
Current liabilities:
Treasury Stock [Text Block]
Vesting [Axis]
Vesting [Domain]
Share-Based Payment Arrangement, Tranche One [Member]
Share-Based Payment Arrangement, Tranche Two [Member]
Assets
us-gaap_Assets
Total assets
Total assets
Supplemental Cash Flow Information:
Patents [Member]
Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table]
Plan Name [Axis]
Plan Name [Domain]
us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount
us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount
Intellectual Property [Member]
us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)
us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
Share-Based Payment Arrangement, Expense, Tax Benefit
Finite-Lived Intangible Assets by Major Class [Axis]
Share-Based Payment Arrangement [Text Block]
Finite-Lived Intangible Assets, Major Class Name [Domain]
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation
Taxes paid on behalf of equity award participants
Effect of cross-border tax laws
us-gaap_ContractWithCustomerAssetNet
Contract with Customer, Asset, after Allowance for Credit Loss
Award Type [Domain]
Effective Income Tax Rate Reconciliation [Table]
Effect of cross-border tax laws, percent
Award Type [Axis]
Net loss
Net loss
Net loss
us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Accumulated Amortization
Net Carrying Amount
us-gaap_FiniteLivedIntangibleAssetsNet
Total
Other intangible assets, net
Standby Letters of Credit [Member]
Restricted Stock Units (RSUs) [Member]
Gross Carrying Amount
Finite-Lived Intangible Assets, Gross
us-gaap_FiniteLivedPatentsGross
Finite-Lived Patents, Gross
Share-Based Payment Arrangement, Option [Member]
Inventory [Axis]
Inventory [Domain]
Loss Contingencies [Table]
Commitments and Contingencies Disclosure [Text Block]
us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Less accumulated depreciation
Property and equipment, net
Total net book value
Goodwill
Goodwill
Pacific Rim and Other Geographical Areas [Member]
Pertains to the Pacific Rim and other geographical areas.
Common Stock Outstanding [Member]
Represents common stock outstanding.
Total cost
Unsecured Debt [Member]
Long-Term Debt, Type [Axis]
California Franchise Tax Board [Member]
Varying Maturity Dates Expiring No Later Than October 8, 2028 [Member]
Varying Maturity Dates Expiring No Later Than October 8, 2028
Long-Term Debt, Type [Domain]
Illinois Department of Revenue [Member]
Illinois Department of Revenue
Political, Geopolitical and Unexpected Events [Policy Text Block]
Disclosure of accounting policy for political, geopolitical and unexpected events.
Other adjustments: deferred revenue, percent
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deferred revenue.
Departments of Revenue, Excluding Illinois [Member]
Departments of Revenue, Excluding Illinois
Incentive Plans [Member]
Pertains to the incentive plans.
Other State Departments of Revenue [Member]
Other State Departments of Revenue
Pennsylvania Department of Revenue [Member]
Pennsylvania Department of Revenue
us-gaap_Investments
Investments
Other tax credits
Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other tax credits.
Net Operating Loss expiration
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to operating Loss expiration.
Schedule of Cash Taxes Paid [Table Text Block]
Tabular disclosure of cash taxes paid.
Other adjustments: deferred revenue
Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deferred revenue.
New Jersey Department of Revenue [Member]
New Jersey Department of Revenue
Louisiana Department of Revenue [Member]
Louisiana Department of Revenue
INVESTING ACTIVITIES
ftek_EffectiveIncomeTaxRateReconciliationOtherTaxCreditPercent
Other tax credits
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other tax credits.
Net loss per common share:
Letter of Credit [Member]
Warrants Issued in Connection with Private Placement [Member]
Represents warrants issued in connection with private placement.
us-gaap_IncomeTaxExpenseBenefit
Income tax expense
Income tax expense
Income tax expense
Accrued liabilities and other non-current liabilities
CHILE
Research and Development Costs
Deferred Tax Assets, Capitalized Research and Development
Amount before allocation of valuation allowances of deferred tax asset attributable to capitalized research and development.
CHINA
us-gaap_IncreaseDecreaseInAccountsPayable
Accounts payable
us-gaap_IncomeTaxPaidFederalAfterRefundReceived
Federal
us-gaap_DebtInstrumentConvertibleCarryingAmountOfTheEquityComponent
Debt Instrument, Convertible, Carrying Amount of Equity Component
us-gaap_DefinedContributionPlanCostRecognized
Defined Contribution Plan, Cost
Granted (in shares)
Class of Warrant or Right, Number of Warrants Issued (in shares)
Represents number of warrants issued.
State taxes
us-gaap_IncomeTaxPaidStateAndLocalAfterRefundReceived
State
Within one year, amortized cost
us-gaap_IncomeTaxPaidForeignAfterRefundReceived
Foreign
Within one year, fair value
Cash
Cash
Cash equivalents
Cash and cash equivalents
us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
Gross unrecognized losses
Gross unrecognized gains
us-gaap_DebtInstrumentConvertibleConversionPrice1
Debt Instrument, Convertible, Conversion Price (in dollars per share)
us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
After-tax effect of stock based compensation
Stock options and restricted stock units, net of forfeitures
us-gaap_AllocatedShareBasedCompensationExpense
us-gaap_DebtInstrumentConvertibleNumberOfEquityInstruments
Debt Instrument, Convertible, Number of Equity Instruments
Amendment Flag
us-gaap_ComprehensiveIncomeNetOfTax
Comprehensive loss
City Area Code
Use of Estimates, Policy [Policy Text Block]
New Accounting Pronouncements, Policy [Policy Text Block]
us-gaap_TreasuryStockSharesAcquired
Treasury Stock, Shares, Acquired (in shares)
us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Loss on disposal of equipment
us-gaap_SharesOutstanding
Balance (in shares)
Balance (in shares)
Common stock, shares outstanding (in shares)
Common Stock, Shares, Outstanding (in shares)
ftek_PercentageOfRevenue
Percentage of Revenue
Represents percentage of revenue.
Financing Receivable, Allowance for Credit Loss [Table Text Block]
Accumulated Other Comprehensive Income (Loss), Policy [Policy Text Block]
Disclosure of accounting policy for accumulated other comprehensive income (loss).
ITALY
Capitalized Third-party Costs [Member]
Represents capitalized third-party costs.
APC Technology [Member]
Represents information related to APC technology.
Current Fiscal Year End Date
us-gaap_DebtInstrumentInterestRateStatedPercentage
Debt Instrument, Interest Rate, Stated Percentage
Liquidity, Policy [Policy Text Block]
Disclosure of accounting policy for liquidity.
us-gaap_LeaseCost
Total lease cost
Foreign Currency Risk Management [Policy Text Block]
Disclosure of the entity's risk management policy for foreign currency exchange rate derivatives.
Prepaid Expenses and Other Current Assets [Policy Text Block]
Disclosure of accounting policy for prepaid expenses and other current assets.
us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Prepaid expenses, other current assets and other non-current assets
us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent
Operating Lease, Weighted Average Discount Rate, Percent
Two Customers [Member]
Represents two customers.
Document Fiscal Period Focus
Operating lease cost
Document Fiscal Year Focus
FUEL CHEM Technology Segment [Member]
Represents FUEL CHEM technologies segment.
us-gaap_IncreaseDecreaseInDeferredIncomeTaxes
Increase (Decrease) in Deferred Income Taxes
Short-term lease cost
Incentive Plan [Member]
Represents information related to incentive plan.
Lease, Cost [Table Text Block]
Antidilutive [Member]
Represents antidilutive.
Document Period End Date
ftek_NumberOfMajorCustomers
Number of Major Customers
Represents the number of major customers accounting for 10% or more of the specified concentration risk benchmark, which includes, but not limited to, sales revenue, accounts receivable, etc.
ftek_PolicyTable
Leased assets obtained in exchange for operating lease liabilities
us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1
Operating Lease, Weighted Average Remaining Lease Term (Year)
Entity File Number
Entity Emerging Growth Company
us-gaap_DebtInstrumentFaceAmount
Debt Instrument, Face Amount
Document Type
us-gaap_DebtInstrumentRepurchaseAmount
Debt Instrument, Repurchase Amount
Interim Period, Costs Not Allocable [Domain]
Entity Small Business
Three Customers [Member]
Represents three customers.
Entity Shell Company
Document Information [Line Items]
ftek_IncreaseDecreaseEmployeeRetentionCreditReceivable
Employee retention credit receivable
Represents the increase (decrease) in employee retention credit receivable.
Document Information [Table]
Nature of Expense [Axis]
Receivable for employee retention credit
Employee Retention Credit Receivable
Represents the receivable for the Employee Retention Credit ("ERC").
us-gaap_AreaOfRealEstateProperty
Area of Real Estate Property (Square Foot)
Entity Public Float
Entity Filer Category
Debt Instrument [Axis]
Entity Current Reporting Status
Debt Instrument, Name [Domain]
us-gaap_RestructuringCharges
Restructuring Charges
Entity Voluntary Filers
Entity Well-known Seasoned Issuer
us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
Impairment, Long-Lived Asset, Held-for-Use
Award Timing MNPI Disclosure [Text Block]
us-gaap_GoodwillImpairmentLoss
Goodwill, Impairment Loss
Schedule of Long-Term Debt Instruments [Table]
us-gaap_ConcentrationRiskPercentage1
Concentration Risk, Percentage
Debt Securities, Held-to-Maturity [Table Text Block]
us-gaap_IncreaseDecreaseInAccountsReceivable
Accounts receivable
Stock compensation expense
ecd_AwardTmgMnpiCnsdrdFlag
Award Timing MNPI Considered [Flag]
Statement of Comprehensive Income [Abstract]
Entity Tax Identification Number
Entity Central Index Key
Insider Trading Policies and Procedures [Line Items]
ftek_ProvisionForDoubtfulAccountsIncludingForeignImpactOfForeignExchange
Provision charged to expense
The amount of provision for doubtful accounts including foreign impact of foreign exchange.
Entity Registrant Name
ftek_AllowanceForDoubtfulAccountsReceivableChargeoffsRecoveries
Write-offs / Recoveries
Amount of direct write-downs or recoveries of receivables charged against the allowance for doubtful accounts.
ecd_InsiderTrdPoliciesProcAdoptedFlag
Insider Trading Policies and Procedures Adopted [Flag]
Entity [Domain]
Customer Concentration Risk [Member]
Legal Entity [Axis]
Entity Address, Address Line One
us-gaap_AmortizationOfIntangibleAssets
Amortization of Intangible Assets
us-gaap_TreasuryStockValueAcquiredCostMethod
Treasury Stock, Value, Acquired, Cost Method
ftek_DeferredFederalIncomeTaxExpenseBenefitNetOfAdjustment
Deferred Federal Income Tax Expense (Benefit), Net of Adjustment
Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations, net of adjustments.
ecd_NonRule10b51ArrTrmntdFlag
Non-Rule 10b5-1 Arrangement Terminated [Flag]
Entity Address, City or Town
ftek_DeferredIncomeTaxExpenseValuationAllowance
Deferred Income Tax Expense, Valuation Allowance
The amount of valuation allowance allocated to deferred income tax expense.
ecd_Rule10b51ArrTrmntdFlag
Rule 10b5-1 Arrangement Terminated [Flag]
Fuel Tech S.p.A [Member]
Related to Fuel Tech S.p.A.
ecd_Rule10b51ArrAdoptedFlag
Rule 10b5-1 Arrangement Adopted [Flag]
Entity Address, Postal Zip Code
Building and Leasehold Improvements [Member]
Related to building and leasehold improvements.
us-gaap_TreasuryStockCommonValue
Treasury Stock, Common, Value
Treasury stock, at cost (Note 5)
Field Equipment [Member]
Related to field equipment.
Entity Address, State or Province
Concentration Risk Type [Axis]
ecd_NonRule10b51ArrAdoptedFlag
Non-Rule 10b5-1 Arrangement Adopted [Flag]
Computer Equipment and Software [Member]
Related to computer equipment and software.
Allowance for credit losses
Allowance for credit losses
Allowance for doubtful accounts
Allowance for doubtful accounts
Concentration Risk Type [Domain]
Material Terms of Trading Arrangement [Text Block]
ftek_DeferredTaxAssetsGoodwill
Goodwill
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from goodwill.
Royalty accruals
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from royalty accruals.
Entity Common Stock, Shares Outstanding
Trading Arrangements, by Individual [Table]
Reserved For Issuance Upon Exercise Or Vesting Of Equity Awards [Member]
Related to stock reserved for issuance upon exercise or vesting of equity awards.
NIL Coupon Non-redeemable Convertible Unsecured Loan Notes [Member]
Related to nil coupon non-redeemable convertible unsecured loan notes.
Revenue Benchmark [Member]
Inventory reserve
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from inventory reserve.
ftek_DeferredTaxAssetsDepreciation
Depreciation
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from depreciation.
ftek_NetDeferredTaxAssetBeforeValuationAllowance
Net deferred tax asset before valuation allowance
Net deferred tax asset before valuation allowance.
Charged to costs and expenses
The amount of change in valuation allowance deferred tax asset charged to costs and expenses.
us-gaap_IncreaseDecreaseInInventories
Inventories
Trading Symbol
Range One [Member]
Represents range one.
Range Two [Member]
Represents range two.
Concentration Risk Benchmark [Axis]
Concentration Risk Benchmark [Domain]
Local Phone Number
Cash Collateral Security Agreement [Member]
Represents Cash Collateral Security Agreement.
Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block]
Wahlco [Member]
Wahlco
ftek_AdditionalNumberOfLeases
Additional Number of Leases
Additional Number Of Leases
us-gaap_TableTextBlock
Notes Tables
Technology Rights, Patents, and Trademarks [Member]
Technology Rights, Patents, and Trademarks
Common shares issued upon vesting of restricted stock units (in shares)
Gallarate Italy [Member]
Represents Gallarate Italy.
us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
Stock Issued During Period, Value, Stock Options Exercised
Aurora Illinois [Member]]
Represents Aurora Illinois.
Common shares issued upon vesting of restricted stock units
Selling, general and administrative
Selling, general and administrative
Accrual to return
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to accrual to return.
Provision for credit losses, net of recoveries
Non-cash transfer from other non-current assets to property and equipment
The amount of non-cash transfer from other noncurrent assets to property and equipment.
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)
us-gaap_WarrantsAndRightsOutstandingTerm
Warrants and Rights Outstanding, Term (Year)
Equipment Constructed for Resale [Member]
Related to equipment constructed for resale.
Chile outside basis differential
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to outside basis differential.
us-gaap_StockIssuedDuringPeriodSharesNewIssues
Stock Issued During Period, Shares, New Issues (in shares)
us-gaap_RestrictedCashAndInvestments
Restricted Cash and Investments
Fair value
Fair value
us-gaap_LiabilitiesAndStockholdersEquity
Total liabilities and stockholders’ equity
UNITED STATES
Asset Pledged as Collateral [Member]
Vesting If Total Revenue RSU, New Business Growth RSU, or Operating Income Growth RSU Awarded [Member]
Represents vesting ig Total Revenue RSU, New Business Growth RSU, or Operating Income Growth RSU are awarded.
Research and development
Research and development
Accumulated deficit
Accumulated other comprehensive loss
Tranche One, If Look-Back RSUs Awarded [Member]
Represents tranche one, if look-back RSUs are awarded.
Short-Term Debt [Table]
Tranche Three, If Look-Back RSUs Awarded [Member]
represents tranche three if look-back RSUs are awarded.
Tranche Two, If Look-Back RSUs Awarded [Member]
Represents tranche two if look-back RSUs are awarded.
Chilean Tax Authority [Member[
Represents the Chilean tax authority.
Debt Disclosure [Text Block]
Cash and Cash Equivalents [Domain]
Changes in operating assets and liabilities:
SOUTH AFRICA
Restricted Cash and Cash Equivalents [Axis]
us-gaap_DisclosureTextBlockAbstract
Notes to Financial Statements
Schedule of Cash and Cash Equivalents [Table Text Block]
Operating lease liabilities - non-current
Total
Total operating lease liabilities
Deferred income taxes
us-gaap_DeferredIncomeTaxesAndTaxCredits
Operating lease liabilities - current
Right-of-use operating lease assets
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue
Total lease payments
us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount
Less imputed interest
us-gaap_DeferredIncomeTaxExpenseBenefit
Total deferred
us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive
Thereafter
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree
2028
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour
2029
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive
2030
us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense
Deferred Compensation Arrangement with Individual, Compensation Expense
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive
Thereafter
Fair Value Measurement, Policy [Policy Text Block]
us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
2027
us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
2028
us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
2029
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths
2026
us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
2030
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo
2027
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]
us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
2026
ftek_StandardProductWarrantyPeriod
Standard Product Warranty Period (Year)
Represents standard product warranty period.
Foreign Currency Transactions and Translations Policy [Policy Text Block]
Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block]
Stock-based compensation, net of forfeitures
Other assets
Lessee, Leases [Policy Text Block]
Amortization Period (Year)
Finite-Lived Intangible Asset, Useful Life (Year)
Earnings Per Share, Policy [Policy Text Block]
us-gaap_Revenues
Revenues
Amortization
Income Tax, Policy [Policy Text Block]
Schedule of Finite-Lived Intangible Assets [Table Text Block]
Deferred Bonus and Profit Sharing Arrangements, Individual Contracts, Type of Deferred Compensation [Axis]
Deferred Bonus and Profit Sharing Arrangement, Individual Contract, Type of Deferred Compensation [Domain]
Research and Development Expense, Policy [Policy Text Block]
Long-term investments
Depreciation
Depreciation
us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation
Taxes paid on behalf of equity award participants (in shares)
us-gaap_SharesIssuedPricePerShare
Shares Issued, Price Per Share (in dollars per share)
us-gaap_AssetsCurrent
Total current assets
Share-Based Payment Arrangement [Policy Text Block]
Equity [Text Block]
Pension and Other Postretirement Plans, Nonpension Benefits, Policy [Policy Text Block]
us-gaap_InterestAndDividendIncomeSecuritiesHeldToMaturity
Non-cash interest income on held-to-maturity securities
us-gaap_TreasuryStockCommonShares
Treasury Stock, Common, Shares (in shares)
us-gaap_AssetsNet
Total net assets
Selling, General and Administrative Expenses, Policy [Policy Text Block]
Common stock, $.01 par value, 40,000,000 shares authorized, 32,281,179 and 31,767,329 shares issued, and 31,074,438 and 30,708,273 shares outstanding in 2025 and 2024, respectively
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Common stock, shares authorized (in shares)
Americas [Member]
Common stock, shares issued (in shares)
Common Stock, Shares, Issued (in shares)
Common stock, par value (in dollars per share)
Stockholders' Equity, Policy [Policy Text Block]
(Deductions)/Other
Standard Product Warranty, Policy [Policy Text Block]
us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
Common Stock, Capital Shares Reserved for Future Issuance (in shares)
us-gaap_DeferredTaxAssetsValuationAllowance
Valuation allowances for deferred tax assets
Balance
Balance
Statistical Measurement [Domain]
Lessee, Lease, Description [Table]
Cash paid for amounts included in the measurement of lease liabilities
Maximum [Member]
Summary of Valuation Allowance [Table Text Block]
Minimum [Member]
Product and Service [Axis]
Product and Service [Domain]
Statistical Measurement [Axis]
us-gaap_NumberOfReportingUnits
Number of Reporting Units
Goodwill and Intangible Assets, Intangible Assets, Policy [Policy Text Block]
us-gaap_DeferredTaxAssetsOther
Other
Geographical [Axis]
Geographical [Domain]
Property, Plant and Equipment [Table Text Block]
us-gaap_DeferredTaxAssetsGross
Total deferred tax assets
Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block]
ftek_InvestmentPlanMaximumAmountApproved
Investment Plan, Maximum Amount. Approved
Maximum amount approved for investment plan.
us-gaap_DeferredIncomeTaxLiabilities
Total deferred tax liabilities
Europe [Member]
Inventories, net
Inventory, Net
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]
ftek_PercentageOfFaceAmountOfLettersOfCreditAsCollateral
Percentage of Face Amount of Letters of Credit As Collateral
Percentage of face amount of letters of credit as collateral.
ftek_PaymentBasisPointsOnFaceValueOfLettersOfCredit
Payment, Basis Points on Face Value of Letters of Credit
Payment as basis points on face value of letters of credit.
us-gaap_InventoryValuationReserves
Inventory Valuation Reserves
ftek_DebtSecuritiesHeldtomaturityMaturityTerm
Debt Securities, Held-to-maturity, Maturity Term (Month)
Maturity term of debt security, held-to-maturity securities.
Customer [Axis]
Customer [Domain]
Depreciable Life (Year)
Construction in Progress [Member]
Unbilled receivables
OPERATING ACTIVITIES
Other short-term receivables
Schedule of Segment Reporting Information, by Segment [Table Text Block]
Bad debt allowance
Schedule of Segment Reporting Information, by Segment [Table]
Revenue [Policy Text Block]
Statement [Line Items]
Trade receivables
Furniture and Fixtures [Member]
Accounts receivable, less current expected credit loss of $108 and $106, respectively
Total accounts receivable
us-gaap_StandardProductWarrantyAccrual
Standard Product Warranty Accrual
us-gaap_NumberOfReportableSegments
Number of Reportable Segments
us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Stock compensation expense
us-gaap_StandardProductWarrantyAccrualPeriodIncreaseDecrease
Standard Product Warranty Accrual, Period Increase (Decrease)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Building [Member]
AOCI Attributable to Parent [Member]
Short-term investments
Additional paid-in capital
Land [Member]
Property, Plant and Equipment, Policy [Policy Text Block]
Other (expense) income, net
Long-Lived Tangible Asset [Axis]
Segment Reporting Disclosure [Text Block]
Credit carry-forwards
Long-Lived Tangible Asset [Domain]
Stockholders’ equity:
Net operating loss carryforwards
Current assets:
Deferred tax assets:
us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents
Total cash and cash equivalents shown in the Consolidated Statements of Cash Flows
us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations
Cash and cash equivalents at beginning of period
Cash and cash equivalents at end of period
Inventory, Policy [Policy Text Block]
Private Placement [Member]
Interest income
us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect
Net increase (decrease) in cash and cash equivalents
us-gaap_Liabilities
Total liabilities
Total liabilities
us-gaap_NetCashProvidedByUsedInFinancingActivities
Net cash used in financing activities
Commitments and contingencies (Note 9)
Sale of Stock [Axis]
Sale of Stock [Domain]
Effect of exchange rate fluctuations on cash
us-gaap_OperatingIncomeLoss
Operating income (loss) from continuing operations
us-gaap_ContractWithCustomerLiabilityRevenueRecognized
Contract with Customer, Liability, Revenue Recognized
us-gaap_NetCashProvidedByUsedInOperatingActivities
Net cash provided by (used in) operating activities
us-gaap_DeferredTaxLiabilities
Net deferred tax liability
us-gaap_NetCashProvidedByUsedInInvestingActivities
Net cash provided by (used in) investing activities
Prepaid expenses and other current assets
us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Intangible assets
Cost of sales
Cost of sales
us-gaap_GrossProfit
Gross margin
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
Deferred income taxes
us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued
Investment, Policy [Policy Text Block]
Concentration Risk, Credit Risk, Policy [Policy Text Block]
us-gaap_LettersOfCreditOutstandingAmount
Letters of Credit Outstanding, Amount
Deferred tax liabilities:
us-gaap_PaymentsForRepurchaseOfEquity
Taxes paid on behalf of equity award participants
us-gaap_CostsAndExpenses
Total costs and expenses
Costs and expenses:
Cost of Goods and Service [Policy Text Block]
Retained Earnings [Member]
us-gaap_ProceedsFromStockOptionsExercised
Proceeds from Stock Options Exercised
Revenues
Revenues from external customers
us-gaap_CurrentStateAndLocalTaxExpenseBenefit
State
us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
State
Treasury Stock, Common [Member]
us-gaap_CurrentForeignTaxExpenseBenefit
Foreign
Additional Paid-in Capital [Member]
us-gaap_CurrentFederalTaxExpenseBenefit
Federal
us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Federal
Deferred:
Class of Treasury Stock [Table]
Equity Components [Axis]
Equity Component [Domain]
Current:
Stock, Class of Stock [Table]
us-gaap_CurrentIncomeTaxExpenseBenefit
Total current
us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Year)
Exercise price (in dollars per share)
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)
us-gaap_RevenueRemainingPerformanceObligation
Revenue, Remaining Performance Obligation, Amount
Class of Warrant or Right [Axis]
Class of Warrant or Right [Domain]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]
us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign
Foreign
Number outstanding (in shares)
Class of Warrant or Right, Outstanding (in shares)
Outstanding (in shares)
Outstanding (in shares)
Class of Warrant or Right [Table]
us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Loss before income taxes
State Administration of Taxation, China [Member]
us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)
United States
After one year through two years, fair value
Fair value of investment in debt security measured at amortized cost (held-to-maturity), with single maturity date and allocated without single maturity date, maturing 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).
Deferred revenue
us-gaap_DeferredRevenueCurrent
After two years through three years, fair value
Fair value of investment in debt security measured at amortized cost (held-to-maturity), with single maturity date and allocated without single maturity date, maturing 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).
ICFR Auditor Attestation Flag
Ministry of Economic Affairs and Finance, Italy [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block]
After one year through two years, amortized cost
Amount, after allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity) with single maturity date and allocated without single maturity date, maturing 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).
Other comprehensive loss:
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Nil coupon perpetual loan notes
After two years through three years, amortized cost
Amount, after allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity) with single maturity date and allocated without single maturity date, maturing 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).
Timing of Transfer of Good or Service [Domain]
Income Tax Authority, Name [Axis]
Vehicles [Member]
Transferred at Point in Time [Member]
Income Tax Authority, Name [Domain]
Transferred over Time [Member]
Income Tax Jurisdiction [Axis]
Income Tax Jurisdiction [Domain]
Disaggregation of Revenue [Table Text Block]
Disaggregation of Revenue [Table]
Domestic Tax Jurisdiction [Member]
Foreign Tax Jurisdiction [Member]
Timing of Transfer of Good or Service [Axis]
us-gaap_ResultsOfOperationsIncomeBeforeIncomeTaxes
Loss before income taxes
Revenue from Contract with Customer [Text Block]
Document Annual Report
Accounts Receivable [Policy Text Block]
Cash and Cash Equivalents, Policy [Policy Text Block]
In Process Equipment [Member]
Related to in process equipment.
Other Deferred true up
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other deferred true-up.
Entity Incorporation, State or Country Code
us-gaap_UnrecognizedTaxBenefits
Balance
Balance
us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
Unrecognized Tax Benefits that Would Impact Effective Tax Rate
Accounting Policies [Abstract]
us-gaap_OpenTaxYear
Open Tax Year
Document Transition Report
Document Financial Statement Error Correction [Flag]
Basis of Accounting, Policy [Policy Text Block]
Selling, General and Administrative Expenses [Member]
Entity Interactive Data Current
Security Exchange Name
Change in positions taken in a current period
Title of 12(b) Security
Nil Coupon Perpetual Loan Notes [Member]
Refers to perpetual loan notes with a nil coupon.
Statement of Income Location, Balance [Axis]
Statement of Income Location, Balance [Domain]
Office Building [Member]
Real Estate, Type of Property [Axis]
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
Real Estate [Domain]
Auditor Name
Auditor Firm ID
Auditor Location
Segments [Axis]
Name of Property [Axis]
Segments [Domain]
Name of Property [Domain]
Other Operating Segment [Member]
Air Pollution Control [Member]
Refers to the Air Pollution Control segment.
Pledging Purpose [Domain]
us-gaap_SharePrice
Share Price (in dollars per share)
us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)
Diluted (in shares)
us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Diluted weighted-average shares (in shares)
Other accrued liabilities
ftek_OtherAccruedLiabilitiesMiscellaneousCurrent
Amount of miscellaneous expenses incurred but not yet paid classified as other, due within one year or the normal operating cycle, if longer.
FUEL CHEM [Member]
Refers to the FUEL CHEM technology segment.
Non-US [Member]
Pledging Purpose [Axis]
us-gaap_OperatingLossCarryforwards
Operating Loss Carryforwards
us-gaap_UnbilledContractsReceivable
Unbilled Contracts Receivable
Statement [Table]
Statement of Financial Position [Abstract]
Diluted net loss per common share (in dollars per share)
The 2024 Plan [Member]
Represents the 2024 equity plan.
Basic (in shares)
Basic weighted-average shares (in shares)
Share based compensation
Other adjustments, percent
us-gaap_EffectiveIncomeTaxRateContinuingOperations
Income tax expense, percent
Effect of changes in tax laws or rates enacted in the current period, percent
Basic net loss per common share (in dollars per share)
Credit Loss, Financial Instrument [Policy Text Block]
Changes in valuation allowances (federal only), percent
Ancillary Revenue [Member]
Refers to revenue from ancillary sources.
Statement of Cash Flows [Abstract]
ftek_ContractWithCustomerContractsInProgressNumberOfContractsIdentifiedAsLossContracts
Contract with Customer, Contracts in Progress, Number of Contracts Identified as Loss Contracts
The number of contracts in progress identified as loss contracts.
Statement of Stockholders' Equity [Abstract]
Technology Solutions [Member]
Refers to the technology solutions product and services segment.
Spare Parts [Member]
Refers to the spare parts product or services segment.
Income Statement [Abstract]
Foreign currency translation adjustments (1)
Lessee, Operating Leases, Supplemental Cash Flow Information [Table Text Block]
Tabular disclosure of supplemental cash flow information related to operating leases of lessee.
Revenue from External Customers by Geographic Areas [Table Text Block]
us-gaap_LesseeOperatingLeaseRemainingLeaseTerm
Lessee, Operating Lease, Remaining Lease Term (Year)
Changes in unrecognized tax benefits, percent
Backlog [Member]
Related to backlog.
Operating Lease Liabilities [Table Text Block]
Tabular disclosure for lessee's operating leases.
Other Current Liabilities [Table Text Block]
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]
us-gaap_RestructuringAndRelatedCostExpectedCostRemaining1
Restructuring and Related Cost, Expected Cost Remaining
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]
Investments Classified by Contractual Maturity Date [Table Text Block]
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
Other nondeductible, percent
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
Stock compensation, percent
Accounting Standards Update and Change in Accounting Principle [Table]
Offsetting Liabilities [Table]
Asset Acquisition [Axis]
Type of Restructuring [Domain]
Restructuring and Related Activities Disclosure [Text Block]
State and income tax, percent
Restructuring and Related Costs [Table Text Block]
Foreign tax effects, including foreign valuation allowance, percent
Restructuring Cost [Table]
Restructuring Type [Axis]
Research and development credit
R&D tax credits, percent
Other adjustments
FINANCING ACTIVITIES
Provision at the U.S. federal statutory rate, percent
Other liabilities
Effect of changes in tax laws or rates enacted in the current period
Asset Acquisition [Domain]
Changes in valuation allowances (federal only)
Changes in unrecognized tax benefits
The Placement Agent Warrants [Member]
Represents the placement agent warrants.
Pledged Status [Domain]
Pledged Status [Axis]
us-gaap_StockholdersEquity
Total stockholders’ equity
Balance
Balance
Weighted average remaining life (Year)
The weighted average remaining life of warrants or rights.
Other nondeductible
Schedule of Warrant Activity [Table Text Block]
The tabular disclosure of activity in warrants outstanding.
Class of Stock [Axis]
Class of Stock [Domain]
Warrants Disclosure [Text Block]
The entire disclosure of warrants.
Stock compensation
Exercised (in shares)
The number of warrants or rights exercised during period.
The 2014 Long-term Incentive Plan [Member]
Represents the 2014 long-term incentive plan.
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Deferred Compensation Plan for Directors [Member]
Represents the deferred compensation plan for directors.
Weighted-Average Exercise Price (in dollars per share)
Weighted-Average Remaining Contractual Life (Year)
Upper Limit (in dollars per share)
Shares Outstanding (in shares)
Exercise Price Range [Axis]
State and income tax
Exercise Price Range [Domain]
Foreign tax effects, including foreign valuation allowance
Lower Limit (in dollars per share)
us-gaap_IncomeTaxReconciliationTaxCreditsResearch
R&D tax credits