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Note 17 - Net Earnings (Loss) Per Common Share (Details) - Reconciliation of the Denominator Used to Calculate Earnings Per Common Share | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Note 17 - Net Earnings (Loss) Per Common Share (Details) - Reconciliation of the Denominator Used to Calculate Earnings Per Common Share [Line Items] |  |  |
Shares issued and outstanding at beginning of period | 35,801,732 us-gaap_CommonStockSharesOutstanding | 30,070,104 us-gaap_CommonStockSharesOutstanding | 29,941,254 us-gaap_CommonStockSharesOutstanding
Issued during the period | 335,253 us-gaap_StockIssuedDuringPeriodSharesIssuedForCash | 2,968,064 us-gaap_StockIssuedDuringPeriodSharesIssuedForCash | 250,868 us-gaap_StockIssuedDuringPeriodSharesIssuedForCash
Repurchased during the period | (220,333)us-gaap_StockRepurchasedDuringPeriodShares | (110,455)us-gaap_StockRepurchasedDuringPeriodShares | (165,703)us-gaap_StockRepurchasedDuringPeriodShares
Weighted average number of shares used in computing basic earnings per share | 35,916,652 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 32,927,713 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 30,026,419 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Number of shares used in computing diluted earningsper share | 36,308,978 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 33,262,299 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 30,375,950 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Denominator [Member] |  |  |
Note 17 - Net Earnings (Loss) Per Common Share (Details) - Reconciliation of the Denominator Used to Calculate Earnings Per Common Share [Line Items] |  |  |
Assumed exercise of stock options, net of shares assumed acquired under the Treasury Stock Method | 392,326 us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants / fsrv_EarningsPerShareAxis = fsrv_DenominatorMember | 334,586 us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants / fsrv_EarningsPerShareAxis = fsrv_DenominatorMember | 349,531 us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants / fsrv_EarningsPerShareAxis = fsrv_DenominatorMember

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- Definition Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Definition Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of call options and warrants using the treasury stock method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Warrant -URI http://asc.fasb.org/extlink&oid=6528364 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 23 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1757-109256 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Treasury Stock Method -URI http://asc.fasb.org/extlink&oid=6527216 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Call Option -URI http://asc.fasb.org/extlink&oid=6506649 + Details
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- Definition Number of shares issued as consideration for cash for development stage entities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 915 -SubTopic 215 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6472370&loc=d3e38297-110927 + Details
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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1505-109256 + Details
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