Note 2 - Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2022

Notes Tables

Accounts Receivable, Allowance for Credit Loss [Table Text Block]

	2022			2021
Beginning balance	$	6		$	19
Provision		70			2
Recoveries/write-offs		(3	)		(15	)
Ending balance	$	73		$	6

Schedule of Product Warranty Liability [Table Text Block]

	2022			2021
Beginning balance	$	187		$	193
Warranty provision		22			49
Usage/Release		(100	)		(55	)
Ending balance	$	109		$	187

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

	Year Ended December 31,
	2022			2021
Net loss applicable to common stockholders	$	(27,244	)	$	(21,587	)
Weighted average common stock outstanding, basic and diluted		6,249			4,722
Net loss per share attributable to common stockholders, basic and diluted	$	(4.36	)	$	(4.57	)

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

	Year Ended December 31,
	2022		2021
Common stock warrants equivalents		4,009,679		135,429
Common stock options		303		304
Convertible preferred stock		58,080		52,289
Unvested restricted stock units		6,626		17,817
		4,074,688		205,839