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Note 6 - Derivative Instruments - Schedule of Derivative Instruments (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Sep. 30, 2024
--- | --- | ---
Not Designated as Hedging Instrument [Member] |  |
Fair value of assets | $ 21 | $ 9
Fair value of liabilities | (33,540) | (2,128)
Cross Currency Interest Rate Contract [Member] | Designated as Hedging Instrument [Member] |  |
Notional amount | 260,025 | 75,978
Fair value of assets | 0 | 0
Fair value of liabilities | (33,420) | (1,915)
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member] |  |
Notional amount | 44,603 | 60,101
Fair value of assets | 21 | 9
Fair value of liabilities | $ (120) | $ (213)

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