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Note 12 - Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2024
Notes Tables |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] |
|  | Years ended December 31, |
|  | 2024 |  |  | 2023 |
Tax at federal statutory rate |  | $ | (1,669 | ) |  | $ | (2,430 | )
State, net of federal benefit |  |  | (364 | ) |  |  | (342 | )
Research and development credit |  |  | (162 | ) |  |  | (267 | )
Share-based compensation |  |  | 176 |  |  |  | 178 |
Net operating loss expiration |  |  | 233 |  |  |  | 130 |
Other |  |  | 1 |  |  |  | 3 |
Change in valuation allowance |  |  | 1,785 |  |  |  | 2,728 |
Total provision for income taxes |  | $ | — |  |  | $ | — |
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] |
|  | Years ended December 31, |
|  | 2024 |  |  | 2023 |
Accrued compensation |  | $ | 160 |  |  | $ | 147 |
Inventory adjustments |  |  | 40 |  |  |  | 33 |
Depreciation and amortization |  |  | 14 |  |  |  | 13 |
Share-based compensation |  |  | 924 |  |  |  | 806 |
Net operating loss and tax credit carryforwards |  |  | 34,539 |  |  |  | 32,910 |
Research and development capitalization |  |  | 2,807 |  |  |  | 2,784 |
Other |  |  | 13 |  |  |  | 19 |
Gross Deferred Tax Asset |  |  | 38,497 |  |  |  | 36,712 |
Valuation Allowance |  |  | (38,497 | ) |  |  | (36,712 | )
Net deferred tax asset |  | $ | — |  |  | $ | — |
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] |
|  | Years ended December 31, |
|  | 2024 |  |  | 2023 |
Balance, beginning of year |  | $ | 1,677 |  |  | $ | 1,519 |
Additions based on tax positions related to the current year |  |  | 98 |  |  |  | 158 |
Balance, end of year |  | $ | 1,775 |  |  | $ | 1,677 |

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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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