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Note 9 - Income Taxes - Significant Components of Consolidated Deferred Tax Assets (Details) - USD ($) | Mar. 31, 2021 | Mar. 31, 2020
--- | --- | ---
Depreciation | $ (1,945,788) | $ (128,868)
LIFO to average cost Section 481(a) adjustment | (301,110) | (602,220)
Total deferred tax liabilities | (2,246,898) | (731,088)
Unrealized derivative loss - OCI | 3,564,059 |
Inventory capitalization | 63,468 | 85,137
Postretirement benefits other than pensions | 26,240 | 24,127
Net operating loss carryforward - State |  | 15,012
Restricted stock award compensation | 328,434 | 200,949
Other | 129,121 | 44,717
Total deferred tax assets | 4,111,322 | 369,942
Net deferred tax asset (liability) | $ 1,864,424 |
Net deferred tax asset (liability) |  | $ (361,146)

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