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Note 2 - Stock-based Compensation (Tables)

3 Months Ended

Mar. 31, 2019

Notes Tables

Share-based Payment Arrangement, Activity [Table Text Block]

		Awards Available				Options Outstanding				Weighted Average Exercise Price
Balance December 31, 2018			805				17,491			$	6.49
Restricted stock unit awards granted			—				—				—
Restricted stock unit awards cancelled			—				—				—
Stock option awards granted			(437	)			437				8.91
Stock option awards exercised			—				(155	)			3.42
Stock option awards cancelled			78				(78	)			6.35
Balance March 31, 2019			446				17,695			$	6.58

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

		2019				2018
Expected Life in Years			5.5				5.5
Expected Volatility			81.0	%			82.0	%
Expected Dividend Yield			0.0	%			0.0	%
Risk-Free Interest Rate			2.5	%			2.4	%

X

- Definition

Tabular disclosure of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, and weighted-average grant date fair value.

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- Definition

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+ References

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