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Note 10 - Capital Stock (Details Textual) CAD / shares in Units, $ in Thousands	7 Months Ended	12 Months Ended
	Dec. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2016 CAD CAD / shares
FC Co [Member] | First Payment [Member]
Percentage Payment of Shares Outstanding	5.00%
Payment Formula Base Price			CAD 2.351
FC Co [Member] | Second Payment [Member]
Percentage Payment of Shares Outstanding	5.00%
Payment Formula Base Price			CAD 4.578
Multiple Voting Shares [Member]
Number of Votes for Multiple Voting Shares		20
Subordinate Voting Shares [Member]
Share Price | CAD / shares			CAD 63.74
Contingent Liabiilty Upon Sale of Control | $	$ 166,976	$ 166,976

X

- Definition

Contingent liability upon arm's length sale of control of the Company.

+ References

No definition available.

+ Details

Name:	fsv_ContingentLiabiiltyUponSaleOfControl
Namespace Prefix:	fsv_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents the number of votes for multiple voting shares.

+ References

No definition available.

+ Details

Name:	fsv_NumberOfVotesForMultipleVotingShares
Namespace Prefix:	fsv_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the payment formula base price.

+ References

No definition available.

+ Details

Name:	fsv_PaymentFormulaBasePrice
Namespace Prefix:	fsv_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents the percentage payment of shares outstanding.

+ References

No definition available.

+ Details

Name:	fsv_PercentagePaymentOfSharesOutstanding
Namespace Prefix:	fsv_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Price of a single share of a number of saleable stocks of a company.

+ References

No definition available.

+ Details

Name:	us-gaap_SharePrice
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=fsv_FcCoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementScenarioAxis=fsv_FirstPaymentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementScenarioAxis=fsv_SecondPaymentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementClassOfStockAxis=fsv_MultipleVotingSharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementClassOfStockAxis=fsv_SubordinateVotingSharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: