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Note 12 - 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, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Discount rate | [1],[2],[3] | 4.70% | 5.00% | 2.50%
Ultimate healthcare cost trend rate |  | 4.50% | 4.50% | 4.50%
Participation |  | 60.00% | 60.00% | 60.00%
[1] | Health Care Cost Trend rate is assumed to be 7.5% beginning in 2022 gradually reducing to an ultimate rate of 4.5% in 2031.
[2] | Health Care Cost Trend rate is assumed to be 7.5% beginning in 2023 gradually reducing to an ultimate rate of 4.5% in 2032.
[3] | Health Care Cost Trend rate is assumed to be 8.5% beginning in 2024 gradually reducing to an ultimate rate of 4.5% in 2033.

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