Note 9 - Stock Based Compensation - Fair Value Assumptions (Details) - The 2019 Stock Plan [Member] - $ / shares |
6 Months Ended | |
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Jun. 30, 2025 |
Jun. 30, 2024 |
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| Dividend-yield | 0.00% | 0.00% |
| Risk-free interest rate | 4.30% | 4.08% |
| Expected volatility | 113.50% | 115.42% |
| Expected life (years) (Year) | 5 years 9 months 21 days | 5 years 9 months 21 days |
| Market value per share on grant date (in dollars per share) | $ 2.73 | $ 3.1 |
| Fair value per option on grant date (in dollars per share) | $ 2.32 | $ 2.65 |
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Price of a single share of a number of saleable stocks of a company. No definition available.
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- Definition Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Details
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