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

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- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 181 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480401/815-10-55-181 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-1B Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-1A + Details
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- Details
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- Details
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