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Note 7 - Debt (Details Textual) $ in Thousands, ¥ in Billions	3 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2022 JPY (¥)	Dec. 31, 2021 USD ($)
Long-Term Debt and Lease Obligation, Total		$ 6,677,000		$ 6,989,000
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
Incremental Liquidity Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity		184,000	¥ 25
Revolving Credit Facility [Member] \| Amended Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity		1,500,000
Fair Value, Inputs, Level 2 [Member]
Long-Term Debt, Fair Value		$ 6,400,000		$ 8,300,000