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Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2025 | Mar. 31, 2024
Realized Gain (Loss), Foreign Currency Transaction, before Tax | $ (1.6) | $ (0.4) | $ (1.1) | $ (1.0)

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