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Note 18 - Pension and Postretirement Benefits (Details Textual) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2023 | Dec. 31, 2019
Defined Benefit Plan, Prescription Drug Benefit, Accumulated Postretirement Benefit Obligation, Decrease for Subsidy | $ 1,000,000 | $ 800,000 |  |  |
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate | 7.75% |  |  |  |
Defined Benefit Plan Ultimate Health Care Cost Decreasing Trend Rate | 4.50% |  |  |  |
Defined Benefit Plan, Prescription Drug Benefit, Net Periodic Postretirement Benefit Cost, (Increase) Decrease for Subsidy | $ 118,100 | $ 80,700 | $ 75,800 |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 100.00% |  |  |  |
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage | 100.00% | 100.00% |  |  |
Equity Securities [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 40.00% | 45.00% |  | 40.00% |
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage | 40.00% | 41.40% |  |  |
Debt Securities [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 60.00% | 55.00% |  | 60.00% |
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage | 53.50% | 52.90% |  |  |
Debt Securities [Member] | Veba [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage |  | 100.00% |  |  | 100.00%
Pension Plan And Supplemental Cash Balance Plan [Member] |  |  |  |  |
Defined Benefit Plan, Prescription Drug Benefit, Accumulated Postretirement Benefit Obligation, Decrease for Subsidy | $ 1,700,000 | $ 800,000 |  |  |
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year | $ 1,000,000 |  |  |  |
Pension Plan and SERP Plan [Member] |  |  |  |  |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-Term Rate of Return on Plan Assets | 6.25% | 6.25% | 6.50% |  |

X
- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, 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 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-8 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of contribution expected to be received by defined benefit plan from employer in next fiscal year following current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-18 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of decrease in accumulated postretirement benefit obligation for government subsidy related to prescription drug benefits attributed to past service. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 60 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480266/715-60-50-3 + 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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- Definition Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of (increase) decrease in net periodic benefit cost from government subsidy for prescription drug benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 60 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480266/715-60-50-3 + Details
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- Definition This element represents the projected trend rate for health care costs in the future. + References No definition available. + Details
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