Note 12 - Notes Payable - Senior Unsecured Notes Issuance (Details) $ in Millions	12 Months Ended
Dec. 31, 2018 USD ($)
Senior Unsecured Notes 1 [Member]
Maturity Date	Feb. 28, 2025
Amount Issued	$ 500
Interest Rate	3.30%
Senior Unsecured Notes 2 [Member]
Maturity Date	Sep. 30, 2047
Amount Issued	$ 350
Interest Rate	4.45%
Senior Unsecured Notes 3 [Member]
Maturity Date	Apr. 30, 2027
Amount Issued	$ 400
Interest Rate	3.80%

Face (par) amount of debt instrument at time of issuance.

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- Definition

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

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

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