Note 17 - Stock-based Compensation Plans - Weighted Average of the Assumptions Utilized for Stock Options (Details) - Share-based Payment Arrangement, Option [Member] |
3 Months Ended | 9 Months Ended | |
|---|---|---|---|
Sep. 30, 2020 |
Sep. 30, 2021 |
Sep. 30, 2020 |
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| Dividend yield | 3.10% | 2.30% | 3.00% |
| Expected volatility | 53.70% | 53.30% | 53.10% |
| Risk-free interest rate | 0.40% | 0.70% | 1.40% |
| Expected life of stock options granted during the period (in years) (Year) | 5 years 10 months 24 days | 5 years 10 months 24 days | 5 years 10 months 24 days |
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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://fasb.org/us-gaap/role/ref/legacyRef
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| 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://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| 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://fasb.org/us-gaap/role/ref/legacyRef
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- Details
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