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Note 14 - Equity Incentive Plan - Assumptions Used to Estimate Fair Value of Stock Options and Stock Appreciation Rights (Details) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Expected life of options (in years) (Year) |  |  | 3 years 6 months
Expected dividend yield | 0.00% | 0.00% | 0.00%
Fair value per option | 0.1480 | 0.1631 | 0.1473
Expected life of options (in years) (Year) |  |  | 3 years 6 months
Expected dividend yield | 0.00% | 0.00% | 0.00%
Employee Stock Purchase Plan (ESPP) [Member] |  |  |
Risk-free interest rate | 0.06% |  |
Expected stock price volatility | 32.58% |  |
Expected life of options (in years) (Year) | 6 months |  |
Expected dividend yield | 0.00% |  |
Risk-free interest rate | 0.06% |  |
Expected stock price volatility | 32.58% |  |
Expected life of options (in years) (Year) | 6 months |  |
Expected dividend yield | 0.00% |  |
Minimum [Member] |  |  |
Risk-free interest rate | 0.29% | 0.21% | 1.41%
Expected stock price volatility | 54.80% | 46.48% | 44.27%
Risk-free interest rate | 0.29% | 0.21% | 1.41%
Expected stock price volatility | 54.80% | 46.48% | 44.27%
Maximum [Member] |  |  |
Risk-free interest rate | 1.00% | 1.59% | 2.54%
Expected stock price volatility | 56.35% | 54.06% | 48.52%
Risk-free interest rate | 1.00% | 1.59% | 2.54%
Expected stock price volatility | 56.35% | 54.06% | 48.52%

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- Definition Represents fair value per option related to share based compensation arrangement by share based payment award. + References No definition available. + Details
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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.D.2) -URI http://asc.fasb.org/extlink&oid=122041274&loc=d3e301413-122809 + Details
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