Note 3 - Revenue Recognition (Tables)

6 Months Ended

Jun. 30, 2022

Notes Tables

Disaggregation of Revenue [Table Text Block]

	Three Months Ended June 30,				Six Months Ended June 30,
	2022		2021		2022		2021
	(in thousands)				(in thousands)
U.S.
Systems	$	-	$	-	$	-	$	3
Instruments and accessories		18		79		82		141
Services		75		104		149		202
Leases		51		91		164		181
Total U.S. revenue		144		274		395		527
Outside of U.S. ("OUS")
Systems		-		-		-		921
Instruments and accessories		236		284		519		661
Services		349		302		583		583
Leases		265		242		563		493
Total OUS revenue		850		828		1,665		2,658
Total
Systems		-		-		-		924
Instruments and accessories		254		363		601		802
Services		424		406		732		785
Leases		316		333		727		674
Total revenue	$	994	$	1,102	$	2,060	$	3,185

Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block]

	As of
	June 30, 2022		December 31, 2021
	(in thousands)
Contract Assets	$	57	$	91
Deferred Revenue	$	510	$	543