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Note 7 - Derivative Financial Instruments (Details Textual) | 12 Months Ended
--- | ---
Mar. 31, 2024 USD ($) T | Mar. 31, 2023 USD ($)
Derivative Asset | $ 33,000 | $ 1,600,000
Other Current Assets [Member] |  |
Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Not Offset | 3,000,000 | 2,400,000
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] |  |
Reclassification from AOCI, Current Period, Tax | $ 100,000 | $ 1,000,000
Not Designated as Hedging Instrument [Member] | Short [Member] |  |
Derivative, Nonmonetary Notional Amount, Mass (US Ton) | T | 24,300 |
Not Designated as Hedging Instrument [Member] | Long [Member] |  |
Derivative, Nonmonetary Notional Amount, Mass (US Ton) | T | 4,500 |

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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. 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