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v3.24.0.1

Note 12 - Borrowings - Leverage Ratio (Details) | 12 Months Ended
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Dec. 31, 2023
Maximum [Member] |
Leverage ratio | 0.5
Leverage Ratio1 [Member] |
Spread on variable rate | 0.15%
Leverage Ratio1 [Member] | Secured Overnight Financing Rate (SOFR) [Member] |
Leverage ratio | 1
Leverage Ratio1 [Member] | Base Rate [Member] |
Leverage ratio | 0
Leverage Ratio 2 [Member] |
Spread on variable rate | 15.00%
Leverage Ratio 2 [Member] | Secured Overnight Financing Rate (SOFR) [Member] |
Leverage ratio | 1.25
Leverage Ratio 2 [Member] | Base Rate [Member] |
Leverage ratio | 0.25
Leverage Ratio 3 [Member] |
Spread on variable rate | 20.00%
Leverage Ratio 3 [Member] | Secured Overnight Financing Rate (SOFR) [Member] |
Leverage ratio | 1.5
Leverage Ratio 4 [Member] |
Spread on variable rate | 20.00%
Leverage Ratio 4 [Member] | Secured Overnight Financing Rate (SOFR) [Member] |
Leverage ratio | 1.75
Leverage Ratio 4 [Member] | Base Rate [Member] |
Leverage ratio | 0.75
Leverage Ratio 5 [Member] |
Spread on variable rate | 0.25%
Leverage Ratio 5 [Member] | Secured Overnight Financing Rate (SOFR) [Member] |
Leverage ratio | 2
Leverage Ratio 5 [Member] | Base Rate [Member] |
Leverage ratio | 1

X
- Definition Leverage ratio upon which the interest is determined. + References No definition available. + Details
Name: | ff_LeverageRatio
Namespace Prefix: | ff_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_CreditFacilityAxis=ff_LeverageRatio1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_VariableRateAxis=ff_SecuredOvernightFinancingRateSofrMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_VariableRateAxis=us-gaap_BaseRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_CreditFacilityAxis=ff_LeverageRatio2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_CreditFacilityAxis=ff_LeverageRatio3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_CreditFacilityAxis=ff_LeverageRatio4Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_CreditFacilityAxis=ff_LeverageRatio5Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |