Note 3 - Revenue Recognition (Tables)

6 Months Ended

Jun. 30, 2023

Notes Tables

Disaggregation of Revenue [Table Text Block]

	Three Months Ended June 30,				Six Months Ended June 30,
	2023		2022		2023		2022
	(in thousands)				(in thousands)
U.S.
Systems	$	-	$	-	$	-	$	-
Instruments and accessories		38		18		98		82
Services		76		75		151		149
Leases		19		51		90		164
Total U.S. revenue		133		144		339		395
Outside of U.S. ("OUS")
Systems		-		-		-		-
Instruments and accessories		260		236		493		519
Services		213		349		333		583
Leases		475		265		892		563
Total OUS revenue		948		850		1,718		1,665
Total
Systems		-		-		-		-
Instruments and accessories		298		254		591		601
Services		289		424		484		732
Leases		494		316		982		727
Total revenue	$	1,081	$	994	$	2,057	$	2,060

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

	As of
	June 30, 2023		December 31, 2022
	(in thousands)
Contract Assets	$	70	$	116
Deferred Revenue	$	376	$	465