Note 2 - Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2022

Notes Tables

Revenue from External Customers by Geographic Areas [Table Text Block]

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
North America	$	973	$	939	$	2,844	$	2,857
Asia Pacific		708		677		2,270		1,855
Europe and Middle East		3		-		6		8
Total	$	1,684	$	1,616	$	5,120	$	4,720

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]

		Nine Months Ended
		September 30,
		2022		2021
Convertible preferred stock:
Series B convertible preferred stock	(a)		2,902,810		2,567,255
Series C convertible preferred stockStockholders’	(b)		-		-
Warrants to purchase common stock			9,793,599		9,793,599
Stock options to purchase common stock			4,105,706		3,195,742
Deferred restricted common stock units			668,000		679,000
Deferred restricted common stock awards			226		228