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Note 11 - Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Jun. 30, 2023
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carryforwards | $ 18,900 | $ 17,920
Tax credit carryforwards | 1,800 | 1,530
Lease liability - current and non-current | 63 | 128
Unrealized loss on securities | 247 | 305
IRC Section 174 R&D Expense Capitalization | 2,107 | 1,061
Accrued expenses and other timing | 310 | 143
Stock-based compensation | 63 | 111
Property and equipment, principally due to differences in depreciation | 0 | 0
Total gross deferred tax assets | 23,490 | 21,198
Less — valuation allowance | (23,444) | (21,064)
Net deferred tax assets | 46 | 134
Deferred tax liabilities: |  |
Right-of-use assets | (25) | (55)
Property and equipment, principally due to differences in depreciation | (21) | (79)
Total gross deferred tax liabilities | (46) | (134)
Net deferred tax assets | $ 0 | $ 0

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