Note 9 - Debt (Details Textual) - USD ($) $ in Thousands	3 Months Ended
Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Long-term Debt and Lease Obligation, Total	$ 7,019,000		$ 7,816,000
Debentures Due in 2023 [Member]
Extinguishment of Debt, Amount	$ 250,000
Debt Instrument, Interest Rate, Stated Percentage	3.70%
Payment for Debt Extinguishment or Debt Prepayment Cost	$ 19,000
Gain (Loss) on Extinguishment of Debt, Total	20,000
Debentures Due in 2022 [Member]
Extinguishment of Debt, Amount		$ 375,000
Debt Instrument, Interest Rate, Stated Percentage		2.90%
Payment for Debt Extinguishment or Debt Prepayment Cost		$ 10,000
Gain (Loss) on Extinguishment of Debt, Total		$ 11,000
Commercial Paper [Member]
Short-term Debt, Total	0		0
Fair Value, Inputs, Level 2 [Member]
Long-term Debt, Fair Value	$ 8,400,000		$ 9,400,000

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

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