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Note 2 - Significant Accounting Policies and Basis of Presentation (Tables) | 12 Months Ended
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Dec. 31, 2023
Notes Tables |
Property Plant And Equipment Estimated Useful Lives [Table Text Block] |
Building & building equipment (years) |  |  | 20 – 39 |
Machinery and equipment (years) |  |  | 3 – 33 |
Transportation equipment (years) |  |  | 5 – 33 |
Other (years) |  |  | 5 – 33 |

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- Definition Describes the periods of time over which an entity anticipates to receive utility from its property, plant and equipment (that is, the periods of time over which an entity allocates the initial cost of its property, plant and equipment). + References No definition available. + Details
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Namespace Prefix: | ff_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_TableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration