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Note 15 - Plant Restructuring (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Restructuring Charges, Total | $ 10,011 | $ 1,829 | $ 10,302
Closing of Northwest Plant [Member] |  |  |
Restructuring Charges, Total |  | 500 | 10,400
Operating Lease Costs [Member] |  |  |
Restructuring Charges, Total | 5,400 |  |
Operating Lease Costs [Member] | Closing of Northwest Plant [Member] |  |  |
Restructuring Reserve, Accrual Adjustment |  |  | 3,600
Pension Termination Cost [Member] |  |  |
Restructuring Charges, Total | 4,100 |  |
Employee Severance [Member] |  |  |
Restructuring Charges, Total | 722 | 1,578 | 162
Employee Severance [Member] | Closing Modesto Plant [Member] |  |  |
Restructuring Charges, Total | 600 |  |
Employee Severance [Member] | Closing of Northwest Plant [Member] |  |  |
Restructuring Charges, Total |  |  | 200
Employee Severance [Member] | Closed Plant in the Midwest [Member] |  |  |
Restructuring Charges, Total |  | 1,300 |
Restructuring Reserve, Accrual Adjustment |  |  | (100)
Impairment of Long-Lived Assets [Member] |  |  |
Restructuring Charges, Total | (369) | (384) | 5,065
Restructuring Reserve, Accrual Adjustment | (400) |  |
Impairment of Long-Lived Assets [Member] | Closing of Northwest Plant [Member] |  |  |
Restructuring Charges, Total |  |  | 5,100
Other Restructuring [Member] |  |  |
Restructuring Charges, Total | 9,658 | $ 635 | 5,075
Restructuring Reserve, Accrual Adjustment | $ 100 |  |
Other Restructuring [Member] | Closing of Northwest Plant [Member] |  |  |
Restructuring Charges, Total |  |  | $ 5,100

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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.P.3) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140864-122747 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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- Definition Amount of expense (reversal of expense) which increases (decreases) the restructuring reserve from an adjustment to a previously accrued restructuring liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)(2)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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