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v3.26.1

Note 4 - Restructuring Activities (Details Textual) $ in Thousands | Jun. 30, 2026 USD ($)
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CHINA | Backlog [Member] |
Restructuring and Related Cost, Expected Cost Remaining | $ 3

X
- Definition Amount of expected cost remaining for the specified restructuring cost. + References No definition available. + Details
Name: | us-gaap_RestructuringAndRelatedCostExpectedCostRemaining1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | srt_StatementGeographicalAxis=country_CN
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RestructuringCostAndReserveAxis=ftek_BacklogMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |