Note 2 - Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2020

Notes Tables

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

	Years
Operating lease assets – Senhance System leasing			5
Machinery, manufacturing, and demonstration equipment		3	-	5
Computer equipment			3
Furniture			5
Leasehold improvements	Lesser of lease term or 3 to 10

Disaggregation of Revenue [Table Text Block]

	Year Ended December 31,
	2020		2019
	(in thousands)
U.S.
Systems	$	282	$	90
Instruments and accessories		187		108
Services		380		338
Total U.S. revenue		849		536
Outside of U.S. ("OUS")
Systems		490		5,459
Instruments and accessories		653		1,447
Services		1,183		1,089
Total OUS revenue		2,326		7,995
Total
Systems		772		5,549
Instruments and accessories		840		1,555
Services		1,563		1,427
Total revenue	$	3,175	$	8,531