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Note 2 - Government Tax Credits (Details Textual) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2025
Clean Fuel Production Credit	$ 2.5	$ 2.5

X

- Definition

Represents the amount of clean fuel production credit.

+ References

No definition available.

+ Details

Name:	ff_CleanFuelProductionCredit
Namespace Prefix:	ff_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration