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Note 7 - Derivative Financial Instruments (Tables) | 12 Months Ended
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Mar. 31, 2023
Notes Tables |
Schedule of Derivative Instruments [Table Text Block] |
| Asset Derivatives |  | Liability Derivatives |
| Balance Sheet |  |  |  |  | Balance Sheet |  |  |  |
Derivatives not designated as hedging instruments: | Location |  | Fair Value |  | Location |  | Fair Value |
Hot-rolled coil steel contracts | Current portion of derivative assets |  | $ | 536 |  | Current portion of derivative liability |  | $ | 2,212 |
| Asset Derivatives |  | Liability Derivatives |
| Balance Sheet |  |  |  |  | Balance Sheet |  |  |  |
Derivatives designated as cash flow hedges: | Location |  | Fair Value |  | Location |  | Fair Value |
Hot-rolled coil steel contracts hedging sales |  |  |  |  |  | Current portion of derivative liability |  | $ | 8,905 |
Derivatives not designated as hedging instruments: |  |  |  |  |  |  |  |  |  |
Hot-rolled coil steel contracts | Current portion of derivative assets |  | $ | 4,241 |  | Current portion of derivative liability |  | $ | 5,524 |
Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) [Table Text Block] |
|  |  |  |  |  | Pre- Tax Gain |
|  |  |  | Location of Gain (Loss) |  | (Loss) Reclassified |
|  | Pre-Tax Gain |  | Reclassified |  | from |
|  | (Loss) |  | from AOCI into Net |  | AOCI into Net |
|  | Recognized in OCI |  | Earnings |  | Earnings |
For the twelve months ended March 31, 2023 |  |  |  |  |  |  |  |  |
Hot-rolled coil steel contracts |  | $ | 9,005 |  | Sales |  | $ | (4,116 | )
Total |  | $ | 9,005 |  |  |  | $ | (4,116 | )
For the twelve months ended March 31, 2022 |  |  |  |  |  |  |  |  |
Hot-rolled coil steel contracts |  | $ | (19,908 | ) | Sales |  | $ | (31,753 | )
|  |  |  |  | Costs of goods sold |  |  | 10,633 |
Total |  | $ | (19,908 | ) |  |  | $ | (21,120 | )
Derivative Instruments, Gain (Loss) [Table Text Block] |
|  |  | Gain Recognized in Earnings |
| Location of Gain |  | for Fiscal Year Ended |
| Recognized in Earnings |  | March 31, 2023 |
Hot-rolled coil steel contracts | Gain (loss) on economic hedges of risk |  | $ | 9,306 |
|  |  | Loss Recognized in Earnings |
| Location of Loss |  | for Fiscal Year Ended |
| Recognized in Earnings |  | March 31, 2022 |
Hot-rolled coil steel contracts | Gain (loss) on economic hedges of risk |  | $ | (11,636 | )
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] |
Notes Tables |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] |
|  | Gain (Loss) on |
|  | Derivatives |
Balance at March 31, 2022 |  | $ | (10,269 | )
Other comprehensive income, net of loss, before reclassification |  |  | 6,830 |
Total loss reclassified from AOCI (1) |  |  | 3,122 |
Net current period other comprehensive income |  |  | 9,952 |
Balance at March 31, 2023 |  |  | (317 | )
|  | Gain (Loss) on |
|  | Derivatives |
Balance at March 31, 2021 |  |  | (11,189 | )
Other comprehensive loss, net of income, before reclassification |  |  | (15,098 | )
Total loss reclassified from AOCI (1) |  |  | 16,018 |
Net current period other comprehensive income |  |  | 920 |
Balance at March 31, 2022 |  |  | (10,269 | )

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