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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

X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
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- Definition

Amount, after accumulated amortization, of debt discount.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
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