Note 2 - Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2021

Notes Tables

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

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2021		2020		2021		2020
North America	$	939	$	845	$	2,857	$	1,648
Asia Pacific		677		679		1,855		1,865
Europe and Middle East		-		-		8		5
Latin America		-		-		-		14
Total	$	1,616	$	1,524	$	4,720	$	3,532

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

		Nine Months Ended
		September 30,
		2021		2020
Convertible preferred stock:
Series A convertible preferred stock	(a)		-		-
Series B convertible preferred stock	(b)		2,567,255		2,270,261
Series C convertible preferred stock	(c)		-		-
Warrants to purchase common stock			9,793,599		1,771,088
Stock options to purchase common stock			3,195,742		975,605
Deferred restricted common stock units			679,000		-
Deferred restricted common stock awards			228		234