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Note 7 - Restructuring - Schedule of Restructuring Reserve (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Provisions $ 3,580 $ 3,428 $ 4,011 $ 4,214
Employee Severance [Member]        
Balance at beginning of period     755 665
Provisions     3,769 2,773
Payments     (3,260) (1,231)
Balance at end of period $ 1,264 $ 2,207 $ 1,264 $ 2,207