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Note 9 - Stock Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2025
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, 2024 |  |  | 78 |  |  |  | 7,201 |  |  | $ | 4.06 |
Authorized |  |  | 2,148 |  |  |  |  |  |  |  | - |
Options Granted |  |  | (1,832 | ) |  |  | 1,832 |  |  |  | 2.73 |
Common Stock Granted |  |  | (396 | ) |  |  | - |  |  |  | - |
Exercised |  |  | - |  |  |  | (340 | ) |  |  | 0.76 |
Forfeited/expired |  |  | 84 |  |  |  | (84 | ) |  |  | 4.37 |
Balance as of September 30, 2025 |  |  | 82 |  |  |  | 8,609 |  |  | $ | 3.91 |
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | For the nine months ended September 30, |
Description |  | 2025 |  |  | 2024 |
Dividend-yield |  |  | - | % |  |  | - | %
Risk-free interest rate |  |  | 4.29 | % |  |  | 3.93 | %
Expected volatility |  |  | 113.50 | % |  |  | 115.42 | %
Expected life (years) |  |  | 5.81 |  |  |  | 5.81 |
Market value per share on grant date |  | $ | 2.73 |  |  | $ | 3.10 |
Fair value per option on grant date |  | $ | 2.32 |  |  | $ | 2.65 |

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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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