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Note 10 - Income Taxes (Tables) | 12 Months Ended
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Jun. 30, 2025
Notes Tables |
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] |
|  | Year Ended June 30, |
(In thousands) |  | 2025 |  |  | 2024 |
Current |  |  |  |  |  |  |  |
Federal |  | $ | - |  |  | $ | - |
State and local |  |  | (2 | ) |  |  | (2 | )
Total current tax expense |  | $ | (2 | ) |  | $ | (2 | )
Deferred |  |  |  |  |  |  |  |
Federal |  |  | - |  |  |  | - |
State and local |  |  | - |  |  |  | - |
Total deferred tax benefit/ (expense) |  | $ | - |  |  | $ | - |
Total tax expense |  | $ | (2 | ) |  | $ | (2 | )
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] |
|  | Year Ended June 30, |
(In thousands) |  | 2025 |  |  | 2024 |
Expected benefit |  | $ | 2,908 |  |  | $ | 2,449 |
State tax expense |  |  | (2 | ) |  |  | (2 | )
Tax credits |  |  | 347 |  |  |  | 251 |
Change in valuation allowance |  |  | (3,127 | ) |  |  | (2,465 | )
Stock-based compensation |  |  | (118 | ) |  |  | (271 | )
Prior year true-up |  |  | - |  |  |  | 43 |
Expiration of net operating loss carryovers |  |  | (1 | ) |  |  | - |
Other permanent items |  |  | (9 | ) |  |  | (7 | )
Total income expense |  | $ | (2 | ) |  | $ | (2 | )
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] |
|  | Year Ended June 30, |
(In thousands) |  | 2025 |  |  | 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 |  |  | - |  |  |  | - |
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 |  | $ | - |  |  | $ | - |
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] |
|  | Year Ended June 30, |
(In thousands) |  | 2025 |  |  | 2024 |
Fiscal year beginning balance |  | $ | 604 |  |  | $ | 486 |
Additions for tax positions of current period |  |  | 157 |  |  |  | 136 |
Additions for tax positions of prior years |  |  | 1 |  |  |  | - |
Decreases for tax positions of prior years |  |  | - |  |  |  | (18 | )
Fiscal year ending balance |  | $ | 762 |  |  | $ | 604 |

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-9 + Details
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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-2 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 231 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482663/740-10-55-231 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12A Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12 + Details
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