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Note 1 - Summary of Significant Accounting Policies (Tables) | 12 Months Ended
--- | ---
Mar. 31, 2020
Notes Tables |
Schedule of Inventory, Current [Table Text Block] |
|  | March 31 |
|  | 20 20 |  |  | 2019 |
Prime coil inventory |  | $ | 17,190,435 |  |  | $ | 26,240,439 |
Non-standard coil inventory |  |  | 1,550,734 |  |  |  | 2,078,008 |
Tubular raw material |  |  | 4,888,542 |  |  |  | 4,418,750 |
Tubular finished goods |  |  | 12,038,532 |  |  |  | 16,324,889 |
|  | $ | 35,668,243 |  |  | $ | 49,062,086 |
Property, Plant and Equipment [Table Text Block] |
Buildings (in years) |  | 20 |
Machinery and equipment (in years) | 10 | to | 15
Yard improvements (in years) | 5 | to | 15
Loaders and other rolling stock (in years) | 5 | to | 10

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