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Note 6 - Equity Incentive Plan (Tables)

6 Months Ended

Jun. 30, 2018

Notes Tables

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

		Six Months Ended June 30,
		2018				2017
Risk free interest rate		2.15%	-	2.75%		1.65%	-	1.78%
Expected volatility		37.12%	-	40.81%		42.54%	-	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 June 30,								Six Months Ended June 30,
		2018				2017				2018				2017
Cost of product revenue		$	(28	)		$	102			$	(244	)		$	199
Research and development			241				153				451				163
Selling, general and administrative			1,109				1,029				8,680				2,103
Total stock-based compensation expense		$	1,322			$	1,284			$	8,887			$	2,465

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

		Three Months Ended June 30,								Six Months Ended June 30,
		2018				2017				2018				2017
Grants:
Stock options			17,500				5,500				209,800				410,135
RSAs			-				-				64,578				-
RSUs			-				-				8,130				9,970
Exercises:
Stock options			273,123				3,850				284,548				9,437
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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Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed.

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