Note 2 - Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2020

Notes Tables

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

	March 31,		December 31,
	2020		2019		Change
Customer contracts liabilities:
Marketing programs	$	25	$	108	$	(83	)
Total	$	25	$	108	$	(83	)

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

	Three Months Ended
	March 31,
	2020		2019
North America	$	688	$	1,792
Asia Pacific		597		967
Europe and Middle East		5		246
Latin America		14		-
Other		-		7
Total	$	1,304	$	3,012

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

	Three Months Ended
	March 31,
	2020			2019
Series B convertible preferred stock		32,667	(a)		-
Warrants to purchase common stock		23,665,905			6,408
Stock options to purchase common stock		10,432,654			55,864
Restricted common stock awards		2,620			4,176