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Note 10 - Long-term Debt (Details Textual) $ in Thousands, € in Millions |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
May 17, 2018 EUR (€) | Apr. 19, 2018 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Letters of Credit Outstanding, Amount |  |  | $ 7,624 | $ 10,307
Long Term Debt [Member] |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  | 3.30% | 3.10%
Senior Unsecured Notes [Member] |  |  |  |
Debt Instrument, Term | 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 |  | 5 years |  |
Debt, Weighted Average Interest Rate |  |  | 3.00% | 2.90%
Line of Credit Facility, Remaining Borrowing Capacity |  |  | $ 562,386 |
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 |  | 2.50% |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  |  | 0.50% |

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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=114775744&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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