Note 3 - Revenue Recognition (Tables)

3 Months Ended

Mar. 31, 2022

Notes Tables

Disaggregation of Revenue [Table Text Block]

	Three Months Ended March 31,
	2022		2021
	(in thousands)
U.S.
Systems	$	-	$	3
Instruments and accessories		64		62
Services		74		98
Leases		113		90
Total U.S. revenue		251		253
Outside of U.S. ("OUS")
Systems		-		921
Instruments and accessories		283		377
Services		234		281
Leases		298		251
Total OUS revenue		815		1,830
Total
Systems		-		924
Instruments and accessories		347		439
Services		308		379
Leases		411		341
Total revenue	$	1,066	$	2,083

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

	As of
	March 31, 2022		December 31, 2021
	(in thousands)
Contract Assets	$	68	$	91
Deferred Revenue	$	533	$	543