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Note 3 - Government Tax Credits (Details Textual) $ in Millions	12 Months Ended
	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: