Note 12 - Employee Retirement Plans - Assumed Health Care Trend Rates (Details)	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021
Ultimate health care trend rate	5.00%	5.00%
Year that the rate reaches the ultimate trend rate	2031	2027
Retire Before Age 65 [Member]
Health care cost trend rate assumed for next year (pre-65 / post-65 retirees)	7.00%	6.25%
Retire After Age 65 [Member]
Health care cost trend rate assumed for next year (pre-65 / post-65 retirees)	4.25%	6.25%

Assumed rate, for next fiscal year, based on annual change in cost of health care cost benefits used to measure expected cost of benefits covered by defined benefit postretirement plan. Factors include, but are not limited to, estimate of health care inflation, change in health care utilization or delivery pattern, technological advances, and change in health status of participant. Excludes factors for change in composition of plan population by age and dependency status.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (l)
-URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

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Ultimate trend rate for health care cost for defined benefit postretirement plan.

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Year ultimate health care cost trend rate is expected to be reached, in YYYY format.

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