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Note 11 - Segment Information (Details Textual) $ in Thousands | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2025 USD ($) | Dec. 31, 2024 USD ($) | Sep. 30, 2024 USD ($)
Number of Reportable Segments | 2 |  |
Number of RINs in Inventory | 400,000 | 3,100,000 | 5,000,000
RIN, Fair Market Value | $ 361 | $ 1,831 | $ 2,556
RIN, Cost | $ 0 | $ 0 | $ 0
Chemicals [Member] |  |  |
Number of Reportable Segments | 2 |  |

X
- Definition The number of RINs in inventory. + References No definition available. + Details
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Namespace Prefix: | ff_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of cost of RINs. + References No definition available. + Details
Name: | ff_RINCost
Namespace Prefix: | ff_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of fair market value of RINs. + References No definition available. + Details
Name: | ff_RINFairMarketValue
Namespace Prefix: | ff_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 47 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482785/280-10-55-47 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 54 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482785/280-10-55-54 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-18 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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