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Note 10 - Retirement Plans - Plan Assets (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
--- | --- | --- | ---
Target Allocation | 100.00% |  |
Percentage of Plan Assets | 100.00% | 100.00% |
Total assets | $ 202,485 | $ 233,112 | $ 212,844
Defined Benefit Plan, Equity Securities [Member] |  |  |
Target Allocation | 99.00% |  |
Percentage of Plan Assets | 97.00% | 99.00% |
Total assets | $ 195,427 | $ 231,725 |
Defined Benefit Plan, Equity Securities [Member] | Materials [Member] |  |  |
Total assets | 8,772 | 5,331 |
Defined Benefit Plan, Equity Securities [Member] | Industrials [Member] |  |  |
Total assets | 15,440 | 16,080 |
Defined Benefit Plan, Equity Securities [Member] | Telecommunication Services [Member] |  |  |
Total assets | 25,093 | 24,370 |
Defined Benefit Plan, Equity Securities [Member] | Consumer Staples [Member] |  |  |
Total assets | 42,522 | 43,486 |
Defined Benefit Plan, Equity Securities [Member] | Energy [Member] |  |  |
Total assets | 28,538 | 38,230 |
Defined Benefit Plan, Equity Securities [Member] | Financial Services Sector [Member] |  |  |
Total assets | 22,275 | 34,521 |
Defined Benefit Plan, Equity Securities [Member] | Healthcare Sector [Member] |  |  |
Total assets |  | 4,247 |
Defined Benefit Plan, Equity Securities [Member] | Information Technology [Member] |  |  |
Total assets | 20,657 | 28,750 |
Defined Benefit Plan, Equity Securities [Member] | Utilities [Member] |  |  |
Total assets | $ 32,130 | $ 36,710 |
Defined Benefit Plan, Debt Security [Member] |  |  |
Target Allocation |  |  |
Percentage of Plan Assets |  |  |
Defined Benefit Plan, Cash and Cash Equivalents [Member] |  |  |
Total assets | $ 7,058 | $ 1,387 |
Defined Benefit Plan, Cash and Cash Equivalents [Member] | Money Market Funds [Member] |  |  |
Total assets | $ 7,058 | $ 1,387 |
Defined Benefit Plan, Real Estate [Member] |  |  |
Target Allocation |  |  |
Percentage of Plan Assets |  |  |
Defined Benefit Plan, Cash [Member] |  |  |
Target Allocation | 1.00% |  |
Percentage of Plan Assets | 3.00% | 1.00% |

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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 4: 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=118257860&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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