Note 3 - Revenue Recognition (Tables)

9 Months Ended

Sep. 30, 2023

Notes Tables

Disaggregation of Revenue [Table Text Block]

	Three Months Ended September 30,				Nine Months Ended September 30,
(In thousands)	2023		2022		2023		2022
U.S.
Systems	$	-	$	-	$	-	$	-
Instruments and accessories		71		60		169		142
Services		77		75		228		225
Leases		40		46		130		211
Total U.S. revenue		188		181		527		578
Outside of U.S. ("OUS")
Systems		-		1,227		-		1,228
Instruments and accessories		230		677		723		1,195
Services		218		260		551		842
Leases		453		218		1,345		780
Total OUS revenue		901		2,382		2,619		4,045
Total
Systems		-		1,227		-		1,228
Instruments and accessories		301		737		892		1,337
Services		295		335		779		1,067
Leases		493		264		1,475		991
Total revenue	$	1,089	$	2,563	$	3,146	$	4,623

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

	September 30, 2023		December 31, 2022		December 31, 2021
(In thousands)
Contract Assets	$	54	$	116	$	91
Deferred Revenue	$	456	$	465	$	543