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Note 7 - Stock-based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2022
Notes Tables |
Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award [Table Text Block] |
|  | Shares Available for Grant |  |  | Number of Shares Outstanding |  |  | Weighted-Average Exercise Price |
Balance as of December 31, 2021 |  |  | 142 |  |  |  | 3,763 |  |  | $ | 2.29 |
Authorized |  |  | 1,338 |  |  |  | - |  |  |  | - |
Options Granted |  |  | (1,307 | ) |  |  | 1,307 |  |  |  | 10.97 |
RSAs Granted |  |  | (89 | ) |  |  | - |  |  |  | - |
Exercised |  |  | - |  |  |  | (294 | ) |  |  | 0.93 |
Forfeited/expired |  |  | 67 |  |  |  | (67 | ) |  |  | 11.44 |
Balance as of September 30, 2022 |  |  | 151 |  |  |  | 4,709 |  |  | $ | 4.65 |
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | For the nine months ended September 30, 2022 |
Description |  | 2022 |  |  | 2021 |
Dividend-yield |  |  | - | % |  |  | - | %
Risk-free interest rate |  |  | 2.03 | % |  |  | 0.83 | %
Expected volatility |  |  | 117.21 | % |  |  | 100.47 | %
Expected life (years) |  |  | 7.00 |  |  |  | 6.59 |
Market value per share on grant date |  | $ | 10.97 |  |  | $ | 5.30 |
Fair value per option on grant date |  | $ | 9.71 |  |  | $ | 4.68 |

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