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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

X

- 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

X

- 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