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Note 11 - Supplementary Balance Sheet Information - Summary of Valuation Allowance (Details) - SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member] - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Balance | $ 44,222 | $ 7,214 | $ 5,927
Charge to income tax provision (benefit) | 36,475 | 31,793 | (7)
Charged to other accounts | 21,324 | 5,215 | 1,294
Balance | $ 102,021 | $ 44,222 | $ 7,214

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