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Note 13 - Employee Retirement Plans - Schedule of Assumptions Used in Determining Net Periodic Costs and Summary of Healthcare Cost Trend Rates (Details) - Other Postretirement Benefits Plan [Member] | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Discount rate | 2.50% | 2.10% | 3.00%
Ultimate healthcare cost trend rate | 4.50% | 4.50% | 4.50%
Participation | 60.00% | 60.00% | 60.00%

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- Definition Represents the assumed number of participants for determining the health care cost trend rate. + References No definition available. + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Ultimate trend rate for health care cost for defined benefit postretirement plan. + References 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 + Details
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- Details
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