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Note 9 - Retirement Plans - Plan Assets (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
--- | --- | --- | ---
Target Allocation | 100.00% |  |
Percentage of Plan Assets | 100.00% | 100.00% |
Assets by Industry Type | $ 212,844 | $ 207,829 | $ 176,238
Defined Benefit Plan, Equity Securities [Member] |  |  |
Target Allocation | 99.00% |  |
Percentage of Plan Assets | 99.00% | 99.00% |
Assets by Industry Type | $ 212,249 | $ 206,244 |
Defined Benefit Plan, Equity Securities [Member] | Materials [Member] |  |  |
Assets by Industry Type | 10,685 | 10,952 |
Defined Benefit Plan, Equity Securities [Member] | Industrials [Member] |  |  |
Assets by Industry Type | 21,738 | 25,383 |
Defined Benefit Plan, Equity Securities [Member] | Telecommunication Services [Member] |  |  |
Assets by Industry Type | 18,120 | 18,060 |
Defined Benefit Plan, Equity Securities [Member] | Consumer Staples [Member] |  |  |
Assets by Industry Type | 32,543 | 43,641 |
Defined Benefit Plan, Equity Securities [Member] | Energy [Member] |  |  |
Assets by Industry Type | 20,017 | 16,110 |
Defined Benefit Plan, Equity Securities [Member] | Financial Services Sector [Member] |  |  |
Assets by Industry Type | 37,634 | 33,818 |
Defined Benefit Plan, Equity Securities [Member] | Healthcare Sector [Member] |  |  |
Assets by Industry Type | 20,702 | 17,587 |
Defined Benefit Plan, Equity Securities [Member] | Information Technology [Member] |  |  |
Assets by Industry Type | 19,945 | 13,887 |
Defined Benefit Plan, Equity Securities [Member] | Utilities [Member] |  |  |
Assets by Industry Type | $ 30,865 | $ 26,806 |
Defined Benefit Plan, Debt Security [Member] |  |  |
Target Allocation |  |  |
Percentage of Plan Assets |  |  |
Defined Benefit Plan, Cash and Cash Equivalents [Member] |  |  |
Assets by Industry Type | $ 595 | $ 1,585 |
Defined Benefit Plan, Cash and Cash Equivalents [Member] | Money Market Funds [Member] |  |  |
Assets by Industry Type | $ 595 | $ 1,585 |
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 | 1.00% | 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=108410482&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=108410482&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=108410482&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=112275985&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 (b) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 6: 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=108410482&loc=d3e1928-114920 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&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=108410482&loc=d3e1928-114920 + Details
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