Note 3 - Revenue Recognition (Tables)

3 Months Ended

Mar. 31, 2023

Notes Tables

Disaggregation of Revenue [Table Text Block]

	Three Months Ended March 31,
	2023		2022
	(in thousands)
U.S.
Systems	$	-	$	-
Instruments and accessories		60		64
Services		75		74
Leases		71		113
Total U.S. revenue		206		251
Outside of U.S. ("OUS")
Systems		-		-
Instruments and accessories		233		283
Services		120		234
Leases		417		298
Total OUS revenue		770		815
Total
Systems		-		-
Instruments and accessories		293		347
Services		195		308
Leases		488		411
Total revenue	$	976	$	1,066

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

	As of
	March 31, 2023		December 31, 2022
	(in thousands)
Contract Assets	$	81	$	116
Deferred Revenue	$	456	$	465