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Note 7 - Income Taxes - Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Mar. 31, 2017
--- | --- | ---
Future tax credits | $ 5,030 | $ 3,827
Restructuring reserve | 2,374 |
Employee benefits | 2,440 | 3,119
Insurance | 361 | 924
Other comprehensive loss | 8,500 | 7,135
Interest | 31 | 32
Future federal tax credits | 443 |
Prepaid revenue | 15,422 | 17,729
Other | 715 | 472
Net operating loss carryovers | 4,512 |
Total | 39,828 | 33,238
Property basis and depreciation difference | 11,750 | 12,786
481(a) adjustment |  | 429
Inventory valuation | 11,270 | 12,766
Intangibles | 325 | 213
Earnings from equity investment |  | 193
Pension | 2,329 | 3,590
Total | 25,674 | 29,977
Valuation allowance - non-current | 3,865 | 1,891
Net deferred income tax (liability) asset | $ 10,289 | $ 1,370

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