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v3.23.2

Note 10 - Debt Financing (Details Textual) - USD ($) $ in Thousands | Jun. 30, 2022 | Jun. 30, 2023
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Percentage of Face Amount of Letters of Credit As Collateral | 150.00% |
Payment, Basis Points on Face Value of Letters of Credit | 2.50% |
Letters of Credit Outstanding, Amount |  | $ 414
Asset Pledged as Collateral [Member] |  |
Investments |  | $ 621

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- Definition Payment as basis points on face value of letters of credit. + References No definition available. + Details
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Namespace Prefix: | ftek_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of face amount of letters of credit as collateral. + References No definition available. + Details
Name: | ftek_PercentageOfFaceAmountOfLettersOfCreditAsCollateral
Namespace Prefix: | ftek_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Sum of the carrying amounts as of the balance sheet date of all investments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)(h)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |