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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: |