Note 2 - Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2018

Notes Tables

Property, Plant and Equipment [Table Text Block]

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

Disaggregation of Revenue [Table Text Block]

	Year Ended December 31,
	2018		2017		2016
Consolidated Revenue:
Testing	$	39,174	$	36,310	$	35,855
Shipping / Collection (hair)		3,159		3,018		2,687
Other		341		374		438
Total Revenue	$	42,674	$	39,701	$	38,980

Schedule of Stock Based Compensation Expense [Table Text Block]

	Year Ended December 31,
	2018		2017		2016
Cost of revenues	$	62	$	71	$	88
General & administrative		436		398		420
Marketing and selling		29		55		116
Research and development		67		58		47
Total stock compensation	$	594	$	582	$	671

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

	2018		2017		2016
Weighted average common shares outstanding, basic		5,502		5,480		5,447
Dilutive common equivalent shares		45		60		28
Weighted average common shares outstanding, assuming dilution		5,547		5,540		5,475