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Note 12 - Long-term Debt (Details Textual) - USD ($) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Jun. 01, 2015 | Dec. 31, 2016 | Dec. 31, 2015
Letters of Credit Outstanding, Amount |  | $ 12,073 | $ 17,232
Debt Instrument, Interest Rate, Effective Percentage |  | 2.80% | 3.10%
Revolving Credit Facility [Member] | Syndicate of Banks [Member] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 525,000 |  |
Debt Instrument, Term | 5 years |  |
Debt, Weighted Average Interest Rate |  | 2.40% | 2.30%
Line of Credit Facility, Remaining Borrowing Capacity |  | $ 253,696 |
Line of Credit Facility Additional Borrowing Capacity |  | $ 150,000 |
Line of Credit Facility, Expiration Date | Jun. 01, 2020 |  |
Revolving Credit Facility [Member] | Syndicate of Banks [Member] | Minimum [Member] |  |  |
Debt Instrument, Basis Spread on Variable Rate | 1.50% |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  | 0.30% |
Revolving Credit Facility [Member] | Syndicate of Banks [Member] | Maximum [Member] |  |  |
Debt Instrument, Basis Spread on Variable Rate | 2.75% |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  | 0.55% |

X
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be increased to, at the Company's option. + References No definition available. + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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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 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 Reference 2: 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=64930785&loc=d3e28551-108399 + Details
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X
- 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 The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + 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 + 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 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + 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 + Details
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