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Note 16 - Plant Restructuring (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Restructuring Charges, Total | $ 182 | $ 5,626
Closing of Midwest and Northwest Plants [Member] |  |
Restructuring Charges, Total |  | 7,000
Restructuring Credit For Reduced Lease Liability |  | 1,900
Closing of Midwest and Northwest Plants [Member] | Employee Severance [Member] |  |
Restructuring Charges, Total | $ 200 | 1,200
Closing of Midwest and Northwest Plants [Member] | Lease Impairments [Member] |  |
Restructuring Charges, Total |  | 5,300
Closing of Midwest and Northwest Plants [Member] | Equipment Moves [Member] |  |
Restructuring Charges, Total |  | $ 2,400

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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://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109237686&loc=d3e17752-110868 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -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 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=123570139&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)(1)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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