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Note 5 - Other Comprehensive Income (Loss) (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent | $ 1,354 | $ (1,898) | $ 0

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