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Note 12 - Redeemable Non-controlling Interests (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Redeemable Noncontrolling Interest, Equity, Carrying Amount	$ 332,963	$ 233,429	$ 219,135
Common Shares to Be Issued Upon Settlement of All Put or Call Options (in shares)	1,800,000
Potential Increase Decrease to Dilutive Earnings Per Share Put or Call Options Settled with Common Shares (in dollars per share)	$ 0.75
Redemption Amount [Member]
Redeemable Noncontrolling Interest, Equity, Carrying Amount	$ 293,911	$ 208,946

X

- Definition

The shares issued if all put or call options were settled.

+ References

No definition available.

+ Details

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Namespace Prefix:	fsv_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents the potential increase (decrease) to diluted earnings per share if all put or call options were settled with Common Shares.

+ References

No definition available.

+ Details

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Namespace Prefix:	fsv_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
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X

- Definition

As of the reporting date, the aggregate carrying amount of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Subparagraph (12)(c)
-Section S99
-Paragraph 3A
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480244/480-10-S99-3A

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Subparagraph 14
-Paragraph 3A
-Section S99
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480244/480-10-S99-3A

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Subparagraph 15
-Paragraph 3A
-Section S99
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480244/480-10-S99-3A

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Subparagraph (16)(c)
-Paragraph 3A
-Section S99
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480244/480-10-S99-3A

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