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Note 3 - Acquisitions - Acquisition Details (Details) (Parentheticals) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Acquisitions 2015 [Member] |  |
Cash consideration, net of cash acquired |  | $ 175
Acquisitions 2016 [Member] |  |
Cash consideration, net of cash acquired | $ 5,002 |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3179-108585 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_BusinessAcquisitionAxis=fsv_Acquisitions2015Member
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Data Type: | na
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Period Type: |

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- Details
Name: | us-gaap_BusinessAcquisitionAxis=fsv_Acquisitions2016Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |