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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
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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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
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |