Note 2 - Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2021

Notes Tables

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

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2021		2020		2021		2020
North America	$	994	$	116	$	1,919	$	804
Asia Pacific		658		588		1,177		1,185
Europe and Middle East		2		-		8		5
Latin America		-		-		-		14
Total	$	1,654	$	704	$	3,104	$	2,008

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

		Six Months Ended
		June 30,
		2021		2020
Convertible preferred stock:
Series A convertible preferred stock	(a)		-		-
Series B convertible preferred stock	(b)		2,489,542		2,201,634
Series C convertible preferred stock	(c)		-		-
Warrants to purchase common stock			9,793,599		2,358,329
Stock options to purchase common stock			3,188,628		1,002,400
Deferred restricted common stock units			684,000		-
Deferred restricted common stock awards			232		249