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Note 10 - Retirement Plans - Plan Assets (Details) | Mar. 31, 2021 | Mar. 31, 2020
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Target Allocation | 100.00% |
Percentage of Plan Assets | 100.00% | 100.00%
Defined Benefit Plan, Equity Securities [Member] |  |
Target Allocation | 50.00% |
Percentage of Plan Assets | 48.00% | 97.00%
Defined Benefit Plan, Debt Security [Member] |  |
Target Allocation | 50.00% |
Percentage of Plan Assets | 50.00% | 0.00%
Defined Benefit Plan, Real Estate [Member] |  |
Target Allocation | 0.00% |
Percentage of Plan Assets | 0.00% | 0.00%
Defined Benefit Plan, Cash [Member] |  |
Target Allocation | 0.00% |
Percentage of Plan Assets | 2.00% | 3.00%

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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