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Note 12 - Equity Incentive Plan (Tables)

3 Months Ended

Mar. 31, 2020

Notes Tables

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

		Three Months Ended March 31,
		2020				2019
Risk free interest rate		0.35%	-	1.59%		2.44%	-	2.54%
Expected volatility		46.48%	-	49.39%		44.34%	-	44.41%
Expected life (years)			4.0				3.5
Expected dividend yield			0.00%				0.00%

Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]

		Three Months Ended March 31,
		2020				2019
Cost of product revenue		$	146			$	92
Research & development			196				177
Selling, general & administrative			(549	)			1,117
Total stock-based compensation expense		$	(207	)		$	1,386

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

		Three Months Ended March 31,
		2020				2019
Grants:
Stock options			210,775				104,292
RSUs			100,631				165,507
PSUs			57,400				114,500
Exercises:
Stock options			-				500
Forfeitures:
Stock options			33,478				909
RSAs			8,574				3,333
RSUs			63,683				250
PSUs			63,000				-
Expirations:
Stock options			363				16,007

X

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Tabular disclosure of share-based payment arrangement.

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