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Note 7 - Income Taxes - Significant Components of Consolidated Deferred Tax Assets (Details) - USD ($) | Mar. 31, 2020 | Mar. 31, 2019
--- | --- | ---
Depreciation | $ (128,868) | $ (954,569)
LIFO to average cost Section 481(a) adjustment | (602,220) | (903,330)
Total deferred tax liabilities | (731,088) | (1,857,899)
Inventory capitalization | 85,137 | 106,856
Postretirement benefits other than pensions | 24,127 | 50,798
Net operating loss carryforward - State | 15,012 |
Restricted stock award compensation | 200,949 | 120,510
Other | 44,717 | 34,489
Total deferred tax assets | 369,942 | 312,653
Net deferred tax liability | $ (361,146) | $ (1,545,246)

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