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Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Realized Gain (Loss), Foreign Currency Transaction, before Tax | $ 0.2 | $ 0.5 | $ 1.3 | $ 1.5

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