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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
		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.

X

- Definition

Represents the expected forfeiture rate used as a valuation assumption for share-based awards.

+ References

No definition available.

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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

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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

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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

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- Definition

The maximum risk-free interest rate assumption that is used in valuing an option on its own shares.

+ References

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- Definition

The minimum risk-free interest rate assumption that is used in valuing an option on its own shares.

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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

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