Note 2 - Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2022

Notes Tables

Property, Plant and Equipment [Table Text Block]

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

Disaggregation of Revenue [Table Text Block]

	Year Ended December 31,
	2022		2021		2020
Consolidated Revenue:
Testing	$	21,608	$	21,894	$	19,068
Shipping / Collection (hair)		3,476		2,847		2,174
Other		156		168		118
Total Revenue	$	25,240	$	24,909	$	21,360

Schedule of Stock Based Compensation Expense [Table Text Block]

	Year Ended December 31,
	2022		2021		2020
Cost of revenues	$	63	$	63	$	50
General & administrative		626		503		380
Marketing & selling		113		114		74
Research & development		70		63		59
Total stock compensation	$	872	$	743	$	563

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

	2022		2021		2020
Weighted average common shares outstanding, basic		5,626		5,549		5,524
Dilutive common equivalent shares		-		-		-
Weighted average common shares outstanding, assuming dilution		5,626		5,549		5,524