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Note 11 - Common Stock and Stock-based Compensation Plans - Valuation Assumptions (Details) - The 2002 Employee Stock Purchase Plan [Member] - Purchase Rights [Member] | 3 Months Ended | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Expected volatility, minimum | 39.00% | 37.00% | 39.00% | 32.00%
Expected volatility, maximum | 60.00% | 60.00% | 60.00% | 60.00%
Risk-free interest rate, minimum | 0.10% | 0.10% | 0.10% | 0.10%
Risk-free interest rate, maximum | 1.30% | 1.80% | 1.70% | 1.90%

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- 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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- Details
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- Details
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