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Note 11 - Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Jun. 30, 2022
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carryforwards | $ 17,920 | $ 17,202
Tax credit carryforwards | 1,530 | 1,330
Lease liability - current and non-current | 128 | 113
Unrealized loss on securities | 305 | 0
IRC Section 174 R&D Expense Capitalization | 1,061 |
Accrued expenses and other timing | 143 | 180
Stock-based compensation | 111 | 579
Property and equipment, principally due to differences in depreciation | 0 | 0
Total gross deferred tax assets | 21,198 | 19,404
Less — valuation allowance | (21,064) | (19,348)
Net deferred tax assets | 134 | 56
Deferred tax liabilities: |  |
Right-of-use assets | (55) | (34)
Property and equipment, principally due to differences in depreciation | (79) | (22)
Total gross deferred tax liabilities | (134) | (56)
Net deferred tax assets | $ 0 | $ 0

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