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Note 2 - Investments - Schedule of Investments (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Jun. 30, 2025
--- | --- | ---
Debt Securities, Available-for-sale, Adjusted Cost | $ 12,006 | $ 15,972
Debt Securities, Available-for-sale, Unrealized Gain | 0 | 0
Debt Securities, Available-for-sale, Unrealized Loss | (716) | (864)
Debt Securities, Available-for-sale, Fair Value | 11,290 | 15,108
Financial instrument, short-term investments | 11,290 | 15,108
Financial instrument, long-term investments | 0 | 0
Corporate & Government Debt Mutual Funds Securities [Member] |  |
Debt Securities, Available-for-sale, Adjusted Cost | 7,246 | 10,547
Debt Securities, Available-for-sale, Unrealized Gain | 0 | 0
Debt Securities, Available-for-sale, Unrealized Loss | (553) | (668)
Debt Securities, Available-for-sale, Fair Value | 6,693 | 9,879
Financial instrument, short-term investments | 6,693 | 9,879
Financial instrument, long-term investments | 0 | 0
Corporate & Government Debt ETFs Securities [Member] |  |
Debt Securities, Available-for-sale, Adjusted Cost | 4,760 | 5,425
Debt Securities, Available-for-sale, Unrealized Gain | 0 | 0
Debt Securities, Available-for-sale, Unrealized Loss | (163) | (196)
Debt Securities, Available-for-sale, Fair Value | 4,597 | 5,229
Financial instrument, short-term investments | 4,597 | 5,229
Financial instrument, long-term investments | $ 0 | $ 0

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 + Details
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