Note 7 - Accounts Payable and Accrued Liabilities (Tables)

3 Months Ended

Mar. 31, 2023

Notes Tables

Schedule of Accrued Liabilities [Table Text Block]

	March 31, 2023		December 31, 2022
Patent and legal costs	$	129	$	135
Accrued compensation		1,352		1,100
Warranty costs		91		125
Taxes and other		164		103
	$	1,736	$	1,463

Schedule of Product Warranty Liability [Table Text Block]

	Three Months Ended March 31,
	2023			2022
Balance, beginning of period	$	125		$	96
Warranty settlements		(1	)		(54	)
Warranty provision		(33	)		12
Balance, end of period	$	91		$	54