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Note 10 - Derivative Financial Instruments - Foreign Currency Exchange Contracts (Details) - JPY (¥)
Sep. 30, 2025
Jun. 30, 2025
Foreign Exchange Contract [Member]    
Derivative, notional amount   ¥ 1,950,000
Foreign Exchange Contract 1 [Member]    
Derivative, notional amount ¥ 3,250,000 ¥ 1,300,000