Note 2 - Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2021

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
Purchased Software			5

Disaggregation of Revenue [Table Text Block]

	Years Ended December 31,
	2021		2020		2019
	(in thousands)
U.S.
Systems	$	380	$	282	$	90
Instruments and accessories		270		187		108
Services		383		380		338
Total U.S. revenue		1,033		849		536
Outside of U.S. ("OUS")
Systems		4,363		490		5,459
Instruments and accessories		1,699		653		1,447
Services		1,137		1,183		1,089
Total OUS revenue		7,199		2,326		7,995
Total
Systems		4,743		772		5,549
Instruments and accessories		1,969		840		1,555
Services		1,520		1,563		1,427
Total revenue	$	8,232	$	3,175	$	8,531