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Note 18 - Pension and Postretirement Benefits - Summary of Asset Allocation and Target Allocation (Details) | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022
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Target Allocation | 100.00% |  |
Percentage of Plan Assets | 100.00% |  | 100.00%
Equity Securities [Member] |  |  |
Target Allocation | 40.00% | 40.00% | 45.00%
Percentage of Plan Assets | 40.00% |  | 41.40%
Debt Securities [Member] |  |  |
Target Allocation | 60.00% | 60.00% | 55.00%
Percentage of Plan Assets | 53.50% |  | 52.90%
Real Estate [Member] |  |  |
Target Allocation | 0.00% |  |
Percentage of Plan Assets | 5.30% |  | 5.00%
Other Contract [Member] |  |  |
Target Allocation | 0.00% |  |
Percentage of Plan Assets | 1.20% |  | 0.70%

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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 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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