Note 2 - Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2017

Notes Tables

Property, Plant and Equipment [Table Text Block]

Computer software (in years)	3	to	5
Office furniture and equipment (in years)	3	to	7
Laboratory equipment (in years)	5	to	7
Leasehold improvements (in years)		Lesser of estimated useful life or lease term

Schedule of Stock Based Compensation Expense [Table Text Block]

	Year Ended December 31,
	2017		2016		2015
Cost of revenues	$	71	$	88	$	101
General & administrative		398		420		433
Marketing and selling		55		116		108
Research and development		58		47		32
Total stock compensation	$	582	$	671	$	674

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

	2017	2016	2015
Weighted average common shares outstanding, basic	5,480	5,447	5,405
Dilutive common equivalent shares	60	28	7
Weighted average common shares outstanding, assuming dilution	5,540	5,475	5,412