Note 5 - Stock-based Compensation - Schedule of Valuation Assumptions (Details) - Performance Shares [Member] - Valuation Technique, Monte Carlo Pricing Model [Member] - $ / shares |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
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| Expected volatility | 70.90% | 66.30% |
| Risk-free interest rate | 3.80% | 4.30% |
| Minimum [Member] | ||
| Stock price (in dollars per share) | $ 13.14 | $ 25.39 |
| Maximum [Member] | ||
| Stock price (in dollars per share) | $ 13.73 | $ 39.49 |
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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 Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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