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Note 13 - Long-term Debt (Details Textual) $ in Thousands, € in Millions |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
May 17, 2018 EUR (€) | Apr. 19, 2018 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Line of Credit Facility, Remaining Borrowing Capacity |  |  | $ 777,322 |
Letters of Credit Outstanding, Amount |  |  | $ 15,663 | $ 9,836
Long Term Debt [Member] |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  | 3.90% | 3.80%
Senior Unsecured Notes [Member] |  |  |  |
Debt Instrument, Term (Year) | 10 years |  |  |
Debt Instrument, Face Amount | € | € 210 |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 2.23% |  |  |
Revolving Credit Facility [Member] | Syndicate of Banks [Member] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 1,000,000 |  |
Debt Instrument, Term (Year) |  | 5 years |  |
Debt, Weighted Average Interest Rate |  |  | 3.00% | 3.40%
Line of Credit Facility, Additional Borrowing Capacity |  |  | $ 250,000 |
Revolving Credit Facility [Member] | Syndicate of Banks [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] | Syndicate of Banks [Member] | Maximum [Member] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 3.00% |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  |  | 0.60% |

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: 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 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + 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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