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Note 11 - Income Taxes (Tables) | 12 Months Ended
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Jun. 30, 2023
Notes Tables |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] |
|  | Year Ended June 30, |
(In thousands) |  | 2023 |  |  | 2022 |
Expected benefit |  | $ | 2,025 |  |  | $ | 1,749 |
State tax expense |  |  | — |  |  |  | — |
Tax credits |  |  | 200 |  |  |  | 166 |
Change in valuation allowance |  |  | (1,838 | ) |  |  | (1,511 | )
Stock-based compensation |  |  | (296 | ) |  |  | (306 | )
Prior year true-up |  |  | — |  |  |  | (9 | )
Expiration of net operating loss carryovers |  |  | (88 | ) |  |  | (89 | )
Other permanent items |  |  | (3 | ) |  |  | — |
Total income tax benefit |  | $ | — |  |  | $ | — |
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] |
|  | Year Ended June 30, |
(In thousands) |  | 2023 |  |  | 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 |  |  |  | — |
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 |  |  | — |  |  |  | — |
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 |  | $ | — |  |  | $ | — |
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] |
|  | Year Ended June 30, |
(In thousands) |  | 2023 |  |  | 2022 |
Fiscal year beginning balance |  | $ | 400 |  |  | $ | 329 |
Additions for tax positions of current period |  |  | 86 |  |  |  | 71 |
Additions for tax positions of prior years |  |  | — |  |  |  | — |
Decreases for tax positions of prior years |  |  | — |  |  |  | — |
Fiscal year ending balance |  | $ | 486 |  |  | $ | 400 |

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