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Note 15 - Financial Instruments (Details Textual) - Fair Value, Inputs, Level 3 [Member] $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($)
Contingent Consideration Liability [Member]
Fair Value Inputs Discount Rate Data Point Concentration	9.00%
Fair Value Inputs Weighted Average Discount Rate Increase	2.00%
Reduction in Fair Value of Contingent Consideration Liability	$ 219
Minimum [Member] | Contingent Consideration Liability [Member]
Fair Value Inputs, Discount Rate	8.00%
Minimum [Member] | Fair Values For Other Financial Instruments [Member]
Fair Value Inputs, Discount Rate	2.00%
Maximum [Member] | Contingent Consideration Liability [Member]
Fair Value Inputs, Discount Rate	10.00%
Maximum [Member] | Fair Values For Other Financial Instruments [Member]
Fair Value Inputs, Discount Rate	2.50%

X

- Definition

A data point concentration of the interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

No definition available.

+ Details

Name:	fsv_FairValueInputsDiscountRateDataPointConcentration
Namespace Prefix:	fsv_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Increase in the weighted average interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

No definition available.

+ Details

Name:	fsv_FairValueInputsWeightedAverageDiscountRateIncrease
Namespace Prefix:	fsv_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount of contingent consideration liability reduced by increase in the weighted average discount rate.

+ References

No definition available.

+ Details

Name:	fsv_ReductionInFairValueOfContingentConsiderationLiability
Namespace Prefix:	fsv_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

+ Details

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X

- Details

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Namespace Prefix:
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X

- Details

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Namespace Prefix:
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Period Type:

X

- Details

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X

- Details

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- Details

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