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Note 9 - Retirement Plans (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Increase Decrease In Unfunded status | $ 15,100 |  |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax | (11,700) |  |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax | $ (3,900) |  |
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate | 4.14% | 4.35% |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance | $ 212,844 | $ 207,829 | $ 176,238
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) | 6,963 | 34,304 |
Defined Benefit Plan, Plan Assets, Contributions by Employer | 2,732 | 8,200 |
Defined Benefit Plan, Plan Assets, Business Combination | 3,300 |  |
Defined Benefit Plan, Plan Assets, Benefits Paid | 7,980 | 10,913 |
Defined Benefit Plan, Accumulated Benefit Obligation | $ 217,300 | $ 199,200 |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets | 7.25% | 7.25% |
Defined Benefit Plan Actual Gain on Plan Assets | 3.20% |  |
Defined Benefit Plan, Assumed Gain on Plan Assets | 11.80% |  |
Defined Benefit Plan Common Stock Included in Plan Assets | $ 15,300 | $ 18,400 |
Defined Contribution Plan, Employer Discretionary Contribution Amount | 1,600 | 1,900 | 1,800
Multiemployer Plan, Contributions by Employer | $ 2,600 | $ 2,300 | $ 2,500

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- Definition The assumed S&P 500 unaudited gain (excluding dividends) on plan assets. + References No definition available. + Details
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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + 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 (b)(1) -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 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 + Details
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- Definition Amount of payment to participant under defined benefit plan which decreases plan assets. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(5) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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