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Note 7 - Components of Working Capital Accounts (Details Textual) $ in Thousands	Dec. 31, 2023 USD ($)
Other Liabilities [Member]
Value Appreciation Plans	$ 62,268

X

- Definition

Represents the amount of value appreciation plans.

+ References

No definition available.

+ Details

Name:	fsv_ValueAppreciationPlans
Namespace Prefix:	fsv_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_BalanceSheetLocationAxis=us-gaap_OtherLiabilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: