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Note 12 - Long-term Debt (Details Textual) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Senior Notes, Total | $ 150,000 |
The Term Loan [Member] |  |
Long-term Debt, Total | $ 440,000 |
Debt Instrument, Periodic Payment, Percentage | 5.00% |
The Term Loan [Member] | Minimum [Member] |  |
Debt Instrument, Basis Spread on Variable Rate | 0.25% |
The Term Loan [Member] | Maximum [Member] |  |
Debt Instrument, Basis Spread on Variable Rate | 2.50% |
Credit Agreement and Senior Notes [Member] |  |
Debt Instrument, Interest Rate, Effective Percentage | 3.40% | 4.40%
Revolving Credit Facility [Member] |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 450,000 |
Debt, Weighted Average Interest Rate | 3.40% |
Line of Credit Facility, Remaining Borrowing Capacity | $ 422,369 |
Letters of Credit Outstanding, Amount | $ 12,631 | $ 6,316
Revolving Credit Facility [Member] | Minimum [Member] |  |
Debt Instrument, Basis Spread on Variable Rate | 0.25% |
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% |
Number of Annual Principal Payments | 5 |

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6036836-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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=120391452&loc=d3e13212-122682 + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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=120398452&loc=d3e534808-122878 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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