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Note 10 - Debt - Short-term and Long-term Debt (Details) (Parentheticals) - USD ($) $ in Millions | Sep. 30, 2020 | May 08, 2020 | Dec. 31, 2019
--- | --- | --- | ---
The 5.800% Senior Note [Member] |  |  |
Interest rate | 5.80% |  | 5.80%
Unamortized discount | $ 0.3 |  | $ 0.7
The 3.625% Senior Note [Member] |  |  |
Interest rate | 3.625% | 3.625% |
Unamortized discount |  | $ 5.2 |
Unamortized premium | $ 10.9 |  |
The 4.125% Senior Note [Member] |  |  |
Interest rate | 4.125% |  | 4.125%
Unamortized premium | $ 12.8 |  | $ 13.9
The 4.000% Senior Note [Member] |  |  |
Interest rate | 4.00% |  | 4.00%
Unamortized discount | $ 5.7 |  | $ 6.7
The 5.500% Senior Note [Member] |  |  |
Interest rate | 5.50% |  | 5.50%
Unamortized discount | $ 4.3 |  | $ 4.5
The 4.125% Senior Note Maturing September 12, 2022 [Member] |  |  |
Interest rate | 4.125% |  | 4.125%
Unamortized discount | $ 1.2 |  | $ 1.6

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