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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)