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Note 13 - Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2021
Notes Tables |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] |
|  | Years ended December 31, |
|  | 2021 |  |  | 2020 |
Tax at federal statutory rate |  | $ | (2,651 | ) |  | $ | (3,151 | )
State, net of federal benefit |  |  | — |  |  |  | (449 | )
Research and development credit |  |  | (279 | ) |  |  | (276 | )
Share-based compensation |  |  | 264 |  |  |  | 649 |
PPP Note forgiveness |  |  | — |  |  |  | (107 | )
Other |  |  | 2 |  |  |  | 2 |
Change in valuation allowance |  |  | 2,664 |  |  |  | 3,332 |
Total provision for income taxes |  | $ | — |  |  | $ | — |
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] |
|  | Years ended December 31, |
|  | 2021 |  |  | 2020 |
Accrued compensation |  | $ | 191 |  |  | $ | 225 |
Inventory adjustments |  |  | 15 |  |  |  | 335 |
Depreciation and amortization |  |  | 24 |  |  |  | 90 |
Share-based compensation |  |  | 595 |  |  |  | 686 |
Net operating loss and tax credit carryforwards |  |  | 30,277 |  |  |  | 26,931 |
Other |  |  | 2 |  |  |  | 173 |
Gross Deferred Tax Asset |  |  | 31,104 |  |  |  | 28,440 |
Valuation Allowance |  |  | (31,104 | ) |  |  | (28,440 | )
Net deferred tax asset |  | $ | — |  |  | $ | — |
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] |
|  | Years ended December 31, |
|  | 2021 |  |  | 2020 |
Balance, beginning of year |  | $ | 1,235 |  |  | $ | 1,046 |
Additions based on tax positions related to the current year |  |  | 158 |  |  |  | 189 |
Reductions for tax positions related to prior years |  |  | (25 | ) |  |  | — |
Balance, end of year |  | $ | 1,368 |  |  | $ | 1,235 |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319 + Details
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