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Note 4 - Acquisitions - Assets Acquired and Liabilities Assumed (Details) (Parentheticals) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 USD ($)
Acquisitions 2022 [Member] |
Cash acquired | $ 8,318

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- Definition The cash inflow associated with the acquisition of business during the period (for example, cash that was held by the acquired business). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-12 + Details
Name: | us-gaap_CashAcquiredFromAcquisition
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_BusinessAcquisitionAxis=fsv_Acquisitions2022Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |