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Note 8 - Income Taxes - Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Mar. 31, 2019
--- | --- | ---
Future tax credits | $ 5,581 | $ 5,124
Inventory valuation | 163 |
Restructuring reserve | 220 | 1,071
Employee benefits | 2,219 | 2,030
Insurance | 616 | 312
Other comprehensive loss | 26,562 | 6,250
Interest | 24 | 12
Future federal tax credits |  | 654
Prepaid revenue | 565 | 528
Other | 186 | 298
Net operating loss and other tax attribute carryovers | 2,233 | 5,628
Total assets | 38,369 | 21,907
Property basis and depreciation difference | 12,664 | 13,049
Inventory valuation |  | 534
Intangibles | 208 | 286
Income from equity investment | 1,239 |
Right of use assets | 4,373 |
Pension | 7,540 | 1,633
Total liabilities | 26,024 | 15,502
Valuation allowance - non-current | 4,473 | 3,988
Net deferred income tax asset | $ 7,872 | $ 2,417

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