Note 7 - Accounts Payable and Accrued Liabilities (Tables)

3 Months Ended

Mar. 31, 2022

Notes Tables

Schedule of Accrued Liabilities [Table Text Block]

	March 31,		December 31,
	2022		2021
Patent and legal costs	$	77	$	28
Accrued compensation		667		628
Warranty costs		54		96
Consulting costs		-		2
Taxes and other		21		70
Accrued liabilities	$	819	$	824

Schedule of Product Warranty Liability [Table Text Block]

	Three Months Ended March 31,
	2022			2021
Balance, beginning of period	$	96		$	48
Warranty settlements		(54	)		(9	)
Warranty provision		12			19
Balance, end of period	$	54		$	58