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Note 9 - Derivative Financial Instruments (Tables) | 6 Months Ended
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Sep. 30, 2025
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 |  | $ | 990 |  | Current portion of derivative liability |  | $ | 142 |
| 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 |  | $ | 636 |  | Current portion of derivative liability |  | $ | 287 |
Derivative Instruments, Gain (Loss) [Table Text Block] |
|  |  | Gain Recognized in Earnings |
| Location of Gain |  | for the Three Months Ended |
| Recognized in Earnings |  | September 30, 2025 |
Hot-rolled coil steel contracts | Gain on economic hedges of risk |  | $ | 851 |
|  |  | Gain Recognized in Earnings |
| Location of Gain |  | for the Six Months Ended |
| Recognized in Earnings |  | September 30, 2025 |
Hot-rolled coil steel contracts | Gain on economic hedges of risk |  | $ | 1,127 |
|  |  | Gain Recognized in Earnings |
| Location of Gain |  | for the Three Months Ended |
| Recognized in Earnings |  | September 30, 2024 |
Hot-rolled coil steel contracts | Gain on economic hedges of risk |  | $ | 194 |
|  |  | Gain Recognized in Earnings |
| Location of Gain |  | for the Six Months Ended |
| Recognized in Earnings |  | September 30, 2024 |
Hot-rolled coil steel contracts | Gain on economic hedges of risk |  | $ | 5,569 |
Derivatives Not Designated as Hedging Instruments [Table Text Block] |
| Notional Amount |  | Maturity Date |
Hot-rolled coil steel contracts | $ | (28,108 | ) | October 2025 - December 2026 |
| Notional Amount |  | Maturity Date |
Hot-rolled coil steel contracts | $ | (9,522 | ) | April 2025 - December 2025 |

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- Definition Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4CC -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4CC Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4C -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4C Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4E + Details
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- Definition Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item. + References No definition available. + Details
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