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Note 13 - Debt - Schedule of Unsecured Debt (Details) (Parentheticals) - Unsecured Debt [Member] | 3 Months Ended
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Mar. 31, 2022
2.8% Notes, Due February 14, 2032 [Member] |
Debt Instrument, Interest Rate | 2.80%
Debt Instrument, Maturity Date | Feb. 14, 2032
3.375% Notes, Due February 14, 2042 [Member] |
Debt Instrument, Interest Rate | 3.375%
Debt Instrument, Maturity Date | Feb. 14, 2042
The 3.5% Notes, Due February 14, 2053 [Member] |
Debt Instrument, Interest Rate | 3.50%
Debt Instrument, Maturity Date | Feb. 14, 2053
3.85% Notes, Due February 14, 2072 [Member] |
Debt Instrument, Interest Rate | 3.85%
Debt Instrument, Maturity Date | Feb. 14, 2072

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