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Note 9 - Common Stock Incentive, Stock Purchase Plans, and Other Compensation Plans - Schedule of Share-Based Compensation Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024
Share-Based Payment Arrangement, Expense | $ 830 | $ 1,478
Selling, General and Administrative Expenses [Member] |  |
Share-Based Payment Arrangement, Expense | 665 | 1,364
Research and Development Expense [Member] |  |
Share-Based Payment Arrangement, Expense | $ 165 | $ 114

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