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Note 12 - Long-term Debt (Details Textual) $ in Thousands, € in Millions |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Apr. 19, 2018 USD ($) | Dec. 31, 2021 USD ($) | Jul. 28, 2021 USD ($) | Jul. 28, 2021 EUR (€) | Dec. 31, 2020 USD ($) | May 17, 2018 EUR (€)
Line of Credit Facility, Remaining Borrowing Capacity |  | $ 988,167 |  |  | $ 777,322 |
Letters of Credit Outstanding, Amount |  | $ 11,833 |  |  | $ 9,439 |
The 3.02 % 2031 Notes [Member] |  |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 150,000 |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 3.02% | 3.02% |  |
The 1.52% 2031 Notes [Member] |  |  |  |  |  |
Debt Instrument, Face Amount | € |  |  |  | € 125 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 1.52% | 1.52% |  |
Senior Unsecured Notes [Member] |  |  |  |  |  |
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 |  | 1.70% |  |  | 2.10% |
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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