Note 11 - Employee Retirement Plans - Assumed Health Care Trend Rates (Details)	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022
Ultimate health care trend rate	5.00%	5.00%
Year that the rate reaches the ultimate trend rate	2031	2031
Retire Before Age 65 [Member]
Health care cost trend rate assumed for next year (pre-65 / post-65 retirees)	6.75%	7.00%
Retire After Age 65 [Member]
Health care cost trend rate assumed for next year (pre-65 / post-65 retirees)	14.75%	4.25%

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
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (l)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

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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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