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Note 1 - Organization and Significant Accounting Policies - Assumptions Used to Estimate Fair Value of Employee Stock Purchase Plan (Details) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Expected dividend yield | [1] |  |  | 0.00%
Expected volatility, minimum | [1] |  |  | 38.00%
Expected volatility, maximum | [1] |  |  | 49.00%
Risk-free interest rate, minimum | [1] |  |  | 0.50%
Risk-free interest rate, maximum | [1] |  |  | 2.40%
Expected forfeiture | [1] |  |  |
Contractual term of up to (years) (Year) | [1] |  |  | 10 years
Employee Stock Purchase Plan [Member] |  |  |  |
Expected dividend yield |  | 0.00% | 0.00% | 0.00%
Expected volatility, minimum |  | 35.00% | 28.00% | 29.00%
Expected volatility, maximum |  | 42.00% | 46.00% | 57.00%
Risk-free interest rate, minimum |  | 0.70% | 0.50% | 0.30%
Risk-free interest rate, maximum |  | 2.20% | 1.10% | 0.50%
Expected forfeiture |  | 0.00% | 0.00% | 0.00%
Contractual term of up to (years) (Year) |  | 2 years | 2 years | 2 years
[1] | During 2016, the Company granted stock options only to its non-employee directors.

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- Definition Represents the expected forfeiture rate used as a valuation assumption for share-based awards. + 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=109197908&loc=d3e5070-113901 + Details
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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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- Definition Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the 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=109197908&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=115993241&loc=d3e301413-122809 + Details
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