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Note 7 - Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2023
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, 2022 |  |  | 165 |  |  |  | 4,694 |  |  | $ | 4.63 |
Authorized |  |  | 1,435 |  |  |  | - |  |  |  | - |
Options Granted |  |  | (1,178 | ) |  |  | 1,178 |  |  |  | 3.75 |
RSAs Granted |  |  | (244 | ) |  |  | - |  |  |  | - |
Exercised |  |  | - |  |  |  | (106 | ) |  |  | 1.75 |
Forfeited/expired |  |  | 164 |  |  |  | (164 | ) |  |  | 5.26 |
Balance as of June 30, 2023 |  |  | 342 |  |  |  | 5,602 |  |  | $ | 4.48 |
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | For the six months ended June 30, |
Description |  | 2023 |  |  | 2022 |
Dividend-yield |  |  | - | % |  |  | - | %
Risk-free interest rate |  |  | 3.82 | % |  |  | 1.66 | %
Expected volatility |  |  | 125.32 | % |  |  | 113.45 | %
Expected life (years) |  |  | 7.00 |  |  |  | 7.00 |
Market value per share on grant date |  | $ | 3.75 |  |  | $ | 11.31 |
Fair value per option on grant date |  | $ | 3.43 |  |  | $ | 9.89 |

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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