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Note 10 - 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, 2023 | Jun. 30, 2022
Share-Based Payment Arrangement, Expense | $ 1,498 | $ 1,535
Selling, General and Administrative Expenses [Member] |  |
Share-Based Payment Arrangement, Expense | 1,457 | 1,503
Research and Development Expense [Member] |  |
Share-Based Payment Arrangement, Expense | $ 41 | $ 32

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479830/718-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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