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Note 6 - Equity Incentive Plan (Tables)

9 Months Ended

Sep. 30, 2018

Notes Tables

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

		Nine Months Ended September 30,
		2018						2017
Risk free interest rate			2.15%	-	2.82%				1.60%	-	1.78%
Expected volatility			37.12%	-	45.61%				41.36%	-	44.30%
Expected life (years)			4.0	-	4.5					4.0
Expected dividend yield				0.00%						0.00%

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]

		Three Months Ended September 30,								Nine Months Ended September 30,
		2018				2017				2018				2017
Cost of product revenue		$	39			$	107			$	(205	)		$	306
Research and development			239				177				690				340
Selling, general and administrative			899				1,190				9,579				3,294
Total stock-based compensation expense		$	1,177			$	1,474			$	10,064			$	3,940

Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]

		Three Months Ended September 30,								Nine Months Ended September 30,
		2018				2017				2018				2017
Grants:
Stock options			18,500				60,609				228,300				470,744
RSAs			-				14,506				64,578				14,506
RSUs			3,624				-				11,754				9,970
Exercises:
Stock options			-				3,329				284,548				12,766
SARs			-				-				-				5,000

X

- Definition

Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate.

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