Note 3 - Revenue Recognition (Tables)

12 Months Ended

Dec. 31, 2022

Notes Tables

Disaggregation of Revenue [Table Text Block]

	Years Ended December 31,
	2022		2021
	(in thousands)
U.S.
Systems	$	-	$	-
Instruments and accessories		211		273
Services		300		383
Leases		256		377
Total U.S. revenue		767		1,033
Outside of U.S. ("OUS")
Systems		2,551		3,286
Instruments and accessories		1,565		1,840
Services		1,073		1,137
Leases		1,131		936
Total OUS revenue		6,320		7,199
Total
Systems		2,551		3,286
Instruments and accessories		1,776		2,113
Services		1,373		1,520
Leases		1,387		1,313
Total revenue	$	7,087	$	8,232

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

	December 31, 2022		December 31, 2021
	(in thousands)
Contract Assets	$	116	$	91
Deferred Revenue	$	465	$	543