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Note 12 - Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2023
Notes Tables |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] |
|  | Years ended December 31, |
|  | 2023 |  |  | 2022 |
Tax at federal statutory rate |  | $ | (2,430 | ) |  | $ | (2,500 | )
State, net of federal benefit |  |  | (342 | ) |  |  | (190 | )
Research and development credit |  |  | (267 | ) |  |  | (291 | )
Share-based compensation |  |  | 178 |  |  |  | 101 |
Net operating loss expiration |  |  | 130 |  |  |  | — |
Other |  |  | 3 |  |  |  | — |
Change in valuation allowance |  |  | 2,728 |  |  |  | 2,880 |
Total provision for income taxes |  | $ | — |  |  | $ | — |
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] |
|  | Years ended December 31, |
|  | 2023 |  |  | 2022 |
Accrued compensation |  | $ | 147 |  |  | $ | 189 |
Inventory adjustments |  |  | 33 |  |  |  | 24 |
Depreciation and amortization |  |  | 13 |  |  |  | 17 |
Share-based compensation |  |  | 806 |  |  |  | 569 |
Net operating loss and tax credit carryforwards |  |  | 32,910 |  |  |  | 31,499 |
Research and development capitalization |  |  | 2,784 |  |  |  | 1,674 |
Other |  |  | 19 |  |  |  | 12 |
Gross Deferred Tax Asset |  |  | 36,712 |  |  |  | 33,984 |
Valuation Allowance |  |  | (36,712 | ) |  |  | (33,984 | )
Net deferred tax asset |  | $ | — |  |  | $ | — |
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] |
|  | Years ended December 31, |
|  | 2023 |  |  | 2022 |
Balance, beginning of year |  | $ | 1,519 |  |  | $ | 1,368 |
Additions based on tax positions related to the current year |  |  | 158 |  |  |  | 151 |
Balance, end of year |  | $ | 1,677 |  |  | $ | 1,519 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-2 + Details
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