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Note 8 - Long-term Debt (Details Textual) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Senior Notes | $ 150,000 |
Number of Annual Principal Payments | 5 |
Debt Instrument, Interest Rate, Effective Percentage | 3.90% |
Revolving Credit Facility [Member] |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 200,000 |
Debt Instrument, Term | 5 years |
Debt, Weighted Average Interest Rate | 2.20% |
Line of Credit Facility, Remaining Borrowing Capacity | $ 97,114 |
Letters of Credit Outstanding, Amount | 6,198 | $ 5,918
Line of Credit Facility Additional Borrowing Capacity | $ 50,000 |
Revolving Credit Facility [Member] | Minimum [Member] |  |
Debt Instrument, Basis Spread on Variable Rate | 1.25% |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 0.25% |
Revolving Credit Facility [Member] | Maximum [Member] |  |
Debt Instrument, Basis Spread on Variable Rate | 2.50% |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 0.50% |
Senior Notes [Member] |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.84% |

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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 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 2: 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 + Details
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