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Note 1 - Summary of Significant Accounting Policies - Summary of Inventory by Product Group (Details) - USD ($) | Mar. 31, 2020 | Mar. 31, 2019
--- | --- | ---
Inventories | $ 35,668,243 | $ 49,062,086
Prime Coil Inventory [Member] |  |
Raw materials | 17,190,435 | 26,240,439
Non-standard Coil Inventory [Member] |  |
Raw materials | 1,550,734 | 2,078,008
Tubular Inventory [Member] |  |
Raw materials | 4,888,542 | 4,418,750
Finished goods | $ 12,038,532 | $ 16,324,889

X
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