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Note 12 - Long-term Debt (Details) (USD $) | 0 Months Ended | 12 Months Ended | 0 Months Ended |
--- | --- | --- | --- | ---
Jan. 16, 2014 | Dec. 31, 2014 | Jan. 16, 2013 | Dec. 31, 2013
Note 12 - Long-term Debt (Details) [Line Items] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity (in Dollars) |  | $ 500,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity |  |
Credit Facility Term |  | 5 years |  |
Debt, Weighted Average Interest Rate |  | 1.60%us-gaap_DebtWeightedAverageInterestRate |  | 2.00%us-gaap_DebtWeightedAverageInterestRate
Line of Credit Facility, Remaining Borrowing Capacity (in Dollars) |  | 155,583,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity |  | 166,349,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Letters of Credit Outstanding, Amount (in Dollars) |  | 7,856,000 us-gaap_LettersOfCreditOutstandingAmount |  | 7,770,000 us-gaap_LettersOfCreditOutstandingAmount
Debt Instrument, Interest Rate, Effective Percentage |  | 3.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage |  | 4.50%us-gaap_DebtInstrumentInterestRateEffectivePercentage
Proceeds from Issuance of Private Placement (in Dollars) | 5,000 us-gaap_ProceedsFromIssuanceOfPrivatePlacement |  |  |
Beginning January 16, 2021 [Member] |  |  |  |
Note 12 - Long-term Debt (Details) [Line Items] |  |  |  |
Debt Instrument, Number of Annual Principal Repayments |  |  | 5 fsrv_DebtInstrumentNumberOfAnnualPrincipalRepayments / us-gaap_StatementScenarioAxis = fsrv_BeginningJanuary162021Member |
3.84% Notes [Member] |  |  |  |
Note 12 - Long-term Debt (Details) [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 3.84%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = fsrv_Notes3.84PercentMember |
Senior Notes (in Dollars) |  |  | 150,000,000 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = fsrv_Notes3.84PercentMember |
Debt Instrument, Term |  |  | 12 years |
6.40% Senior Notes [Member] |  |  |  |
Note 12 - Long-term Debt (Details) [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 6.40%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = fsrv_SixPoint40PercentSeniorNotesMember |  |
Senior Notes (in Dollars) |  | 12,500,000 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = fsrv_SixPoint40PercentSeniorNotesMember |  | 25,000,000 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = fsrv_SixPoint40PercentSeniorNotesMember
Debt Instrument, Number of Annual Principal Repayments |  | 4 fsrv_DebtInstrumentNumberOfAnnualPrincipalRepayments / us-gaap_DebtInstrumentAxis = fsrv_SixPoint40PercentSeniorNotesMember |  |
5.44% Senior Notes [Member] |  |  |  |
Note 12 - Long-term Debt (Details) [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 5.44%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = fsrv_FivePoint44PercentSeniorNotesMember |  |
Senior Notes (in Dollars) |  | 20,000,000 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = fsrv_FivePoint44PercentSeniorNotesMember |  | 40,000,000 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = fsrv_FivePoint44PercentSeniorNotesMember
Number Of Annual Principal Payments |  | 5 fsrv_NumberOfAnnualPrincipalPayments / us-gaap_DebtInstrumentAxis = fsrv_FivePoint44PercentSeniorNotesMember |  |
Debt Instrument, Periodic Payment (in Dollars) |  | $ 20,000 us-gaap_DebtInstrumentPeriodicPayment / us-gaap_DebtInstrumentAxis = fsrv_FivePoint44PercentSeniorNotesMember |  |
Minimum [Member] |  |  |  |
Note 12 - Long-term Debt (Details) [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 1.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  | 0.25%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Debt Instrument, Term |  | 1 year |  |
Maximum [Member] |  |  |  |
Note 12 - Long-term Debt (Details) [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 3.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  | 0.60%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Debt Instrument, Term |  | 10 years |  |

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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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