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Note 1 - Summary of Significant Accounting Policies - Summary of Inventory by Product Group (Details) - USD ($) | Mar. 31, 2021 | Mar. 31, 2020
--- | --- | ---
Inventory, Net, Total | $ 36,016,093 | $ 35,668,243
Prime Coil Inventory [Member] |  |
Raw materials | 23,079,012 | 17,190,435
Non-standard Coil Inventory [Member] |  |
Raw materials | 1,419,055 | 1,550,734
Tubular Inventory [Member] |  |
Raw materials | 2,607,197 | 4,888,542
Finished goods | $ 8,910,829 | $ 12,038,532

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