Note 7 - Debt (Details Textual) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Long-term Debt and Lease Obligation, Total	$ 6,839,000	$ 6,989,000
Commercial Paper [Member]
Short-term Debt, Total	0		$ 0
Fair Value, Inputs, Level 2 [Member]
Long-term Debt, Fair Value	$ 7,300,000	$ 8,300,000

Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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