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Note 8 - Income Taxes - Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Mar. 31, 2020
--- | --- | ---
Future tax credits | $ 5,884 | $ 5,581
Inventory valuation | 2,204 | 163
Restructuring reserve | 0 | 220
Employee benefits | 2,063 | 2,219
Insurance | 685 | 616
Other comprehensive loss | 6,511 | 26,562
Interest | 4 | 24
Prepaid revenue | 463 | 565
Other | 815 | 186
Equity investment basis difference | 1,589 | 0
Net operating loss and other tax attribute carryovers | 85 | 2,233
Total assets | 20,303 | 38,369
Property basis and depreciation difference | 17,975 | 12,664
Intangibles | 33 | 208
Equity investment basis difference | 0 | 1,239
Right of use assets | 4,371 | 4,373
Pension | 21,556 | 7,540
Total liabilities | 43,935 | 26,024
Valuation allowance - non-current | 4,674 | 4,473
Net deferred income tax liability | $ (28,306) |
Net deferred income tax asset |  | $ 7,872

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