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Note 9 - Fixed Assets (Details Textual) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Finance Lease, Right-of-Use Asset, after Accumulated Amortization, Total | $ 24,198 | $ 21,060
Finance Lease, Right-of-use Asset, Net Book Value | $ 11,416 | $ 10,745

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- Definition Amount of net book value for right-of-use asset under finance lease. + References No definition available. + Details
Name: | fsv_FinanceLeaseRightOfUseAssetNetBookValue
Namespace Prefix: | fsv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount, after accumulated amortization, of right-of-use asset from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
Name: | us-gaap_FinanceLeaseRightOfUseAsset
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant