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Note 3 - Discontinued Operations (Details Textual) - USD ($) |  | 12 Months Ended
--- | --- | ---
Oct. 09, 2018 | Mar. 31, 2020 | Mar. 31, 2019
Effect of LIFO Inventory Liquidation on Income |  |  | $ 6,600,000 | $ 28,700,000
Pension Termination [Member] |  |  |  |
Disposal Group, Including Discontinued Operation, Restructuriing Charge |  |  | (902,000) |
Modesto Facility [Member] | Discontinued Operations, Disposed of by Sale [Member] |  |  |  |
Proceeds from Divestiture of Businesses, Net of Cash Divested, Total |  | $ 63,326,000 |  |
Disposal Group, Including Discontinued Operation, Revenue, Percent |  | 15.00% |  |
Disposal Group, Including Discontinued Operation, Restructuriing Charge | [1] |  | $ (1,150,000) | 4,515,000
Effect of LIFO Inventory Liquidation on Income |  |  |  | 24,211,000
Modesto Facility [Member] | Discontinued Operations, Disposed of by Sale [Member] | Plant and Equipment [Member] |  |  |  |
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property |  |  |  | 51,446,000
Modesto Facility [Member] | Discontinued Operations, Disposed of by Sale [Member] | Bins [Member] |  |  |  |
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property |  |  |  | 4,975,000
Modesto Facility [Member] | Discontinued Operations, Disposed of by Sale [Member] | Employee Severance [Member] |  |  |  |
Restructuring Costs, Total |  |  |  | $ 3,746,000
[1] | Includes $902,000 credit for pension termination in fiscal 2020. Includes $3,746,000 of Modesto severance in fiscal 2019.

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- Definition The effect of liquidating LIFO (last in first out) inventory layers on income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SAB Topic 11.F) -URI http://asc.fasb.org/extlink&oid=27011343&loc=d3e100079-122729 + Details
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