Note 7 - Stock-based Compensation - Assumptions (Details) |
3 Months Ended | 6 Months Ended | |
|---|---|---|---|
Jun. 30, 2021 |
Jun. 30, 2022 |
Jun. 30, 2021 |
|
| Dividend yield | 0.00% | 0.00% | 0.00% |
| Expected term (Year) | 5 years | 5 years | |
| Minimum [Member] | |||
| Risk-free interest rate | 0.77% | 1.91% | 0.46% |
| Expected term (Year) | 5 years 9 months | ||
| Expected volatility | 47.10% | 45.80% | 47.10% |
| Maximum [Member] | |||
| Risk-free interest rate | 0.87% | 2.41% | 0.92% |
| Expected term (Year) | 6 years | ||
| Expected volatility | 47.70% | 46.10% | 92.60% |
| X | ||||||||||
- 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
|
| X | ||||||||||
- 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
|
| X | ||||||||||
- 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
|
| X | ||||||||||
- 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
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|