Note 2 - Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2020

Notes Tables

Schedule of Property Plant and Equipment Useful Life [Table Text Block]

Machinery, manufacturing and demonstration equipment (in years)	3	-	5
Computer equipment (in years)	3
Furniture (in years)	5
Leasehold improvements	Lesser of lease term or 3 to 10 years

Disaggregation of Revenue [Table Text Block]

	Three Months Ended June 30,				Six Months Ended June 30,
	2020		2019		2020		2019
U.S.
Systems	$	45	$	-	$	75	$	-
Instruments and accessories		7		25		67		25
Services		103		127		171		260
Total U.S. revenue		155		152		313		285
Outside of U.S. ("OUS")
Systems		117		2,782		127		4,065
Instruments and accessories		146		535		288		1,081
Services		237		170		527		389
Total OUS revenue		500		3,487		942		5,535
Total
Systems		162		2,782		202		4,065
Instruments and accessories		153		560		355		1,106
Services		340		297		698		649
Total revenue	$	655	$	3,639	$	1,255	$	5,820