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Note 8 - Supplementary Balance Sheet Information - Schedule of Warranty and Retrofit Costs (Details) - USD ($)
$ in Thousands
9 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Balance at beginning of period $ 5,213 $ 3,974
Accruals for warranties during the period 587 1,939
Costs incurred during the period (427) (1,184)
Balance at end of period $ 5,373 $ 4,729