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Note 11 - Retirement Plans - Plan Assets (Details) | Mar. 31, 2023 | Mar. 31, 2022
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Target Allocation | 100.00% |
Percentage of Plan Assets | 100.00% | 100.00%
Defined Benefit Plan, Equity Securities [Member] |  |
Target Allocation | 16.00% |
Percentage of Plan Assets | 13.00% | 21.00%
Defined Benefit Plan, Debt Security [Member] |  |
Target Allocation | 80.00% |
Percentage of Plan Assets | 75.00% | 61.00%
Defined Benefit Plan, Real Estate [Member] |  |
Target Allocation | 2.00% |
Percentage of Plan Assets | 8.00% | 7.00%
Defined Benefit Plan, Cash [Member] |  |
Target Allocation | 1.00% |
Percentage of Plan Assets | 1.00% | 7.00%
Defined Benefit Plan, Other [Member] |  |
Target Allocation | 1.00% |
Percentage of Plan Assets | 3.00% | 4.00%

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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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