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Note 1 - Organization and Significant Accounting Policies - Assumptions Used to Estimate Fair Value of Stock Options Granted (Details)	12 Months Ended
	Dec. 31, 2016	[1]
Expected dividend yield	0.00%
Expected volatility, minimum	38.00%
Expected volatility, maximum	49.00%
Risk-free interest rate, minimum	0.50%
Risk-free interest rate, maximum	2.40%
Expected forfeiture (employees)
Expected forfeiture (executives)	5.00%
Contractual term of up to (years) (Year)	10 years
Employees [Member]
Suboptimal exercise multiple
Executives [Member]
Suboptimal exercise multiple	2.4
[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

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- Definition

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

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- Definition

Represents the suboptimal exercise factor used as an assumption in the valuation of share-based awards.

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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.

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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.

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- Definition

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

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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.

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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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
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