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Note 5 - Derivative Instruments - Schedule of Derivative Instruments (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Sep. 30, 2024
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Cross Currency Interest Rate Contract [Member] | Designated as Hedging Instrument [Member] |  |
Notional amount | $ 260,025 | $ 75,978
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member] |  |
Notional amount | $ 58,920 | $ 60,101

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