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Note 18 - Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2023
Notes Tables |
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] |
|  | For the Years Ended December 31, |
|  | 2023 |  |  | 2022 |
United States |  | $ | (9,640 | ) |  | $ | (10,608 | )
International |  |  | — |  |  |  | — |
|  | $ | (9,640 | ) |  | $ | (10,608 | )
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] |
|  | For the Years Ended December 31, |
|  | 2023 |  |  | 2022 |
Current |  |  |  |  |  |  |  |
Federal |  | $ | — |  |  | $ | — |
State |  |  | — |  |  |  | — |
Other |  |  | — |  |  |  | — |
Total current tax expense |  | $ | — |  |  | $ | — |
Deferred |  |  |  |  |  |  |  |
Federal |  |  | — |  |  |  | — |
State |  |  | — |  |  |  | — |
Other |  |  | — |  |  |  | — |
Total deferred tax expense |  | $ | — |  |  | $ | — |
Income tax provision |  | $ | — |  |  | $ | — |
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] |
|  | For the Years Ended December 31, |
|  | 2023 |  |  | 2022 |
Deferred tax assets: |  |  |  |  |  |  |  |
Net operating losses |  | $ | 36,943 |  |  | $ | 35,234 |
Acquisition assets |  |  | 2,257 |  |  |  | — |
Stock options |  |  | 665 |  |  |  | 750 |
Research and development credits |  |  | 641 |  |  |  | 641 |
Accruals |  |  | 477 |  |  |  | 464 |
Operating lease liabilities |  |  | 368 |  |  |  | 472 |
Property and equipment |  |  | 28 |  |  |  | 13 |
Other deferred tax assets |  |  | 6 |  |  |  | 331 |
Total deferred tax assets |  |  | 41,385 |  |  |  | 37,905 |
Deferred tax liabilities: |  |  |  |  |  |  |  |
Operating lease right-of-use assets |  |  | (337 | ) |  |  | (472 | )
Total deferred tax liabilities |  |  | (337 | ) |  |  | (472 | )
Valuation allowance |  |  | (41,048 | ) |  |  | (37,433 | )
Net deferred taxes |  | $ | — |  |  | $ | — |
Summary of Operating Loss Carryforwards and Tax Credit Carryforwards [Table Text Block] |
|  |  |  |  | Expiration
|  | Amount |  | Years
Net operating losses, federal (Post December 31, 2017) |  | $ | 44,443 |  | Does Not Expire
Net operating losses, federal (Pre January 1, 2018) |  | $ | 94,886 |  | Beginning in 2024
Net operating losses, state |  | $ | 117,375 |  | Beginning in 2028
Tax credits, federal |  | $ | 542 |  | Beginning in 2031
Tax credits, state |  | $ | 125 |  | Indefinite
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] |
|  | For the Years Ended December 31, |
|  | 2023 |  |  | 2022 |
Unrecognized benefit - beginning of period |  | $ | 974 |  |  | $ | 974 |
Change during the period |  |  | — |  |  |  | — |
Unrecognized benefit - end of period |  | $ | 974 |  |  | $ | 974 |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] |
|  | For the Years Ended December 31, |
|  | 2023 |  |  | 2022 |
Statutory rate |  |  | 21.0 | % |  |  | 21.0 | %
State tax |  |  | 4.5 | % |  |  | 7.9 | %
Change in valuation allowance |  |  | (19.5 | %) |  |  | (48.0 | %)
Warrant/equity expenses |  |  | (3.7 | %) |  |  | 20.2 | %
Stock-based compensation expense |  |  | (1.4 | %) |  |  | (4.2 | %)
Impairment of assets |  |  | (0.9 | %) |  |  | — | %
Other |  |  | (0.1 | %) |  |  | (0.1 | %)
Change in value of earnout |  |  | — | % |  |  | 3.2 | %
Total |  |  | 0.0 | % |  |  | 0.0 | %

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