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Weighted-average number of common shares outstanding: Investments Classified by Contractual Maturity Date [Table Text Block] 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. Exercisable, aggregate intrinsic value Common stock, par value (in dollars per share) Within one year, fair value The 2024 Plan [Member] Represents the 2024 equity plan. Other expense, net Ancillary Revenue [Member] Refers to revenue from ancillary sources. Assets us-gaap_Assets Total assets Total assets 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. Technology Solutions [Member] Refers to the technology solutions product and services segment. Spare Parts [Member] Refers to the spare parts product or services segment. Cash and cash equivalents Geographical [Domain] Geographical [Axis] Backlog [Member] Related to backlog. 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Warrants Disclosure [Text Block] The entire disclosure of warrants. The 2014 Long-term Incentive Plan [Member] Represents the 2014 long-term incentive plan. Deferred Compensation Plan for Directors [Member] Represents the deferred compensation plan for directors. Right-of-use operating lease assets, net Other liabilities us-gaap_PaymentsForRepurchaseOfEquity Taxes paid on behalf of equity award participants ecd_Rule10b51ArrTrmntdFlag Rule 10b5-1 Arrangement Terminated [Flag] Revenues Revenues from external customers ecd_Rule10b51ArrAdoptedFlag Rule 10b5-1 Arrangement Adopted [Flag] Inventory, Policy [Policy Text Block] Varying Maturity Dates Expiring No Later Than March 31, 2027 [Member] Related to varying maturity dates.