Note 2 - Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2020

Notes Tables

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

	September 30,		December 31,
	2020		2019		Change
Customer contracts liabilities:
Marketing programs	$	-	$	108	$	(108	)
Total	$	-	$	108	$	(108	)

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

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2019		2018		2019		2018
United States	$	844	$	652	$	1,648	$	3,106
Asia Pacific		680		373		1,865		1,684
Europe and Middle East		-		27		5		316
Latin America		-		-		14		10
Total	$	1,524	$	1,052	$	3,532	$	5,116

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

	Nine Months Ended
	September 30,
	2020			2019
Series B convertible preferred stock		22,702,614	(a)		-
Warrants to purchase common stock		17,710,876			5,549
Stock options to purchase common stock		9,755,454			50,471
Restricted common stock awards		2,217			3,432