Note 2 - Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2020

Notes Tables

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

Operating lease assets – Senhance System leasing (in years)	5
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 September 30,				Nine Months Ended September 30,
	2020		2019		2020		2019
U.S.
Systems	$	101	$	-	$	176	$	-
Instruments and accessories		82		43		149		68
Services		106		99		278		359
Total U.S. revenue		289		142		603		427
Outside of U.S. ("OUS")
Systems		131		1,276		257		5,341
Instruments and accessories		122		330		410		1,411
Services		272		276		798		665
Total OUS revenue		525		1,882		1,465		7,417
Total
Systems		232		1,276		433		5,341
Instruments and accessories		204		373		559		1,479
Services		378		375		1,076		1,024
Total revenue	$	814	$	2,024	$	2,068	$	7,844