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Note 3 - Government Tax Credits (Details Textual) $ in Millions | 12 Months Ended
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Dec. 31, 2023 USD ($)
Small Agri Biodiesel Producers Credit [Member] |
Benefit From Tax Credit, Pretax | $ 1.5

X
- Definition The pretax amount of benefit that is expected to be recognized from a tax credit. + References No definition available. + Details
Name: | ff_BenefitFromTaxCreditPretax
Namespace Prefix: | ff_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_TaxCreditCarryforwardAxis=ff_SmallAgriBiodieselProducersCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |