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Note 10 - Debt - Short-term and Long-term Debt (Details) (Parentheticals) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
The 5.800% Senior Note [Member] |  |
Interest rate | 5.80% | 5.80%
Unamortized discount | $ 0 | $ 100
The 3.625% Senior Note [Member] |  |
Interest rate | 3.625% | 3.625%
Unamortized discount | $ 10,600 | $ 10,700
The 4.125% Senior Note [Member] |  |
Interest rate | 4.125% | 4.125%
Unamortized discount | $ 12,000 | $ 12,400
The 4.000% Senior Note [Member] |  |
Interest rate | 4.00% | 4.00%
Unamortized discount | $ 5,100 | $ 5,400
The 5.500% Senior Note [Member] |  |
Interest rate | 5.50% | 5.50%
Unamortized discount | $ 4,300 | $ 4,300
The 4.125% Senior Note - Further Issuance [Member] |  |
Interest rate | 4.125% | 4.125%
Unamortized discount | $ 900 | $ 1,100

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