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Note 10 - Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Jun. 30, 2024
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carryforwards | $ 20,975 | $ 18,900
Tax credit carryforwards | 2,166 | 1,800
Lease liability - current and non-current | 563 | 63
Unrealized loss on securities | 182 | 247
IRC Section 174 R&D Expense Capitalization | 2,952 | 2,107
Accrued expenses and other timing | 126 | 310
Stock-based compensation | 112 | 63
Property and equipment, principally due to differences in depreciation | 0 | 0
Total gross deferred tax assets | 27,076 | 23,490
Less - valuation allowance | (26,482) | (23,444)
Net deferred tax assets | 594 | 46
Deferred tax liabilities: |  |
Right-of-use assets | (468) | (25)
Property and equipment, principally due to differences in depreciation | (126) | (21)
Total gross deferred tax liabilities | (594) | (46)
Net deferred tax assets | $ 0 | $ 0

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