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Note 9 - Borrowings - Leverage Ratio (Details)	3 Months Ended
	Mar. 31, 2022
Leverage Ratio1 [Member]
Commitment Fee	0.15%
Leverage Ratio1 [Member] | London Interbank Offered Rate (LIBOR) [Member]
Spread on variable rate	1.00%
Leverage Ratio1 [Member] | Base Rate [Member]
Spread on variable rate	0.00%
Leverage Ratio1 [Member] | Maximum [Member]
Leverage ratio	1.00
Leverage Ratio 2 [Member]
Commitment Fee	0.15%
Leverage Ratio 2 [Member] | London Interbank Offered Rate (LIBOR) [Member]
Spread on variable rate	1.25%
Leverage Ratio 2 [Member] | Base Rate [Member]
Spread on variable rate	0.25%
Leverage Ratio 2 [Member] | Maximum [Member]
Leverage ratio	1.50
Leverage Ratio 2 [Member] | Minimum [Member]
Leverage ratio	1.00
Leverage Ratio 3 [Member]
Commitment Fee	0.20%
Leverage Ratio 3 [Member] | London Interbank Offered Rate (LIBOR) [Member]
Spread on variable rate	1.50%
Leverage Ratio 3 [Member] | Base Rate [Member]
Spread on variable rate	0.50%
Leverage Ratio 3 [Member] | Maximum [Member]
Leverage ratio	2.00
Leverage Ratio 3 [Member] | Minimum [Member]
Leverage ratio	1.50
Leverage Ratio 4 [Member]
Commitment Fee	0.20%
Leverage Ratio 4 [Member] | London Interbank Offered Rate (LIBOR) [Member]
Spread on variable rate	1.75%
Leverage Ratio 4 [Member] | Base Rate [Member]
Spread on variable rate	0.75%
Leverage Ratio 4 [Member] | Maximum [Member]
Leverage ratio	2.50
Leverage Ratio 4 [Member] | Minimum [Member]
Leverage ratio	2.00
Leverage Ratio 5 [Member]
Commitment Fee	0.25%
Leverage Ratio 5 [Member] | London Interbank Offered Rate (LIBOR) [Member]
Spread on variable rate	2.00%
Leverage Ratio 5 [Member] | Base Rate [Member]
Spread on variable rate	1.00%
Leverage Ratio 5 [Member] | Minimum [Member]
Leverage ratio	2.50

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

X

- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

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

X

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

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

X

- Details

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