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Note 6 - Share-based Compensation - Black-Scholes Options Pricing Model (Details) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Minimum [Member] |  |
Risk-Free interest rate, minimum | 1.40% |
Risk-Free interest rate, maximum |  | 0.05%
Expected stock price volatility, minimum | 61.30% |
Expected stock price volatility, maximum |  | 54.52%
Expected life of options (Year) | 5 years 6 months | 6 months
Maximum [Member] |  |
Risk-Free interest rate, maximum | 3.24% | 1.24%
Expected stock price volatility, maximum | 61.58% | 60.80%
Expected life of options (Year) | 6 years 3 months | 6 years 3 months

X
- Definition The estimated measure of the maximum 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. + References No definition available. + Details
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- Definition The estimated measure of the minimum 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. + References No definition available. + Details
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- Definition The maximum risk-free interest rate assumption that is used in valuing an option on its own shares. + References No definition available. + Details
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- Definition The minimum risk-free interest rate assumption that is used in valuing an option on its own shares. + References No definition available. + Details
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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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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