Note 2 - Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2021

Notes Tables

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

	December 31,
	2021		2020		Change
Customer contracts liabilities:
Marketing programs	$	7	$	17	$	(10	)
Total	$	7	$	17	$	(10	)

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

	Year Ended December 31,
	2021		2020
United States	$	3,701	$	2,537
Asia Pacific		2,647		2,732
Canada		66		110
Europe and Middle East		12		86
Latin America		-		14
Total	$	6,426	$	5,479

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

		Year Ended December 31,
		2021		2020
Convertible preferred stock:
Series A convertible preferred stock	(a)		-		-
Series B convertible preferred stock	(b)		2,647,320		2,341,111
Series C convertible preferred stock	(c)		-		-
Warrants to purchase common stock			9,793,599		1,728,725
Stock options to purchase common stock			3,173,103		986,399
Deferred restricted common stock units			674,000		-
Deferred restricted common stock awards			228		234