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Note 1 - Summary of Significant Accounting Policies - Summary of Inventory by Product Group (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Mar. 31, 2024
--- | --- | ---
Inventory, Net | $ 113,689 | $ 115,804
Prime Coil Inventory [Member] |  |
Raw materials | 85,865 | 85,483
Non-standard Coil Inventory [Member] |  |
Raw materials | 15,737 | 17,030
Tubular Inventory [Member] |  |
Raw materials | 7,055 | 4,185
Finished goods | $ 5,032 | $ 9,106

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