Note 12 - Debt - Long-term Debt (Details) (Parentheticals)	Dec. 31, 2021	Dec. 31, 2020
Debentures 8.875 Due 2021 [Member]
Interest rate on debt	8.875%	8.875%
Debentures 29% Due 2022 [Member]
Interest rate on debt	2.90%	2.90%
Debentures, 3.70%, due 2023 [Member]
Interest rate on debt	3.70%	3.70%
Medium-Term Notes, Average Rate 7.66%, Due Through 2023 [Member]
Interest rate on debt	7.66%	7.66%
Debentures 3.9 Due 2049 [Member]
Interest rate on debt	3.90%	3.90%
Debentures 5.45 Due 2079 [Member]
Interest rate on debt	5.45%	5.45%
Yen-denominated Debentures, 0.698%, due 2024 [Member]
Interest rate on debt	0.698%	0.698%
Yen-denominated Debentures, 0.722%, due 2025 [Member]
Interest rate on debt	0.722%	0.722%
Yen-denominated Debentures, .992%, due 2027 [Member]
Interest rate on debt	0.992%	0.992%
Yen-denominated Debentures, 1.043%, due 2028 [Member]
Interest rate on debt	1.043%	1.043%
Yen Denominated Debentures, 1.153 Due 2031 [Member]
Interest rate on debt	1.153%	1.153%
Yen Denominated Debentures, 1.513 Due 2039 [Member]
Interest rate on debt	1.513%	1.513%
Debentures, 6.85%, Due 2029 [Member]
Interest rate on debt	6.85%
Yen-denominated Debentures, 1.219%, due 2030 [Member]
Interest rate on debt	1.219%	1.219%
Debentures, Callable, 7.25%, Due 2036 [Member]
Interest rate on debt	7.25%	7.25%
Debentures, 4.70%, Due 2037 [Member]
Interest rate on debt	4.70%	4.70%
Yen-denominated Debentures, 1.583%, due 2037 [Member]
Interest rate on debt	1.583%	1.583%
Debentures, 5.75%, Due 2040 [Member]
Interest rate on debt	5.75%	5.75%
Debentures, 4.75%, Due 2042 [Member]
Interest rate on debt	4.75%	4.75%
Debentures, 5.35%, due 2048 [Member]
Interest rate on debt	5.35%	5.35%
Debentures, 4.375%, due 2057 [Member]
Interest rate on debt	4.375%	4.375%
Debentures, 5.85%, due 2068 [Member]
Interest rate on debt	5.85%	5.85%
Financing Leases, Average Discount Rate 5.7%, Due Through 2044 [Member]
Interest rate on debt	4.40%	4.40%
Other Debt, Average Rate of 4.33% Due Through 2043 [Member]
Interest rate on debt	4.33%	4.33%