Note 7 - Accounts Payable and Accrued Liabilities (Tables)

6 Months Ended

Jun. 30, 2022

Notes Tables

Schedule of Accrued Liabilities [Table Text Block]

	June 30,		December 31,
	2022		2021
Patent and legal costs	$	68	$	28
Accrued compensation		710		628
Warranty costs		78		96
Taxes and other		56		72
	$	912	$	824

Schedule of Product Warranty Liability [Table Text Block]

	Six Months Ended June 30,
	2022			2021
Balance, beginning of period	$	96		$	48
Warranty settlements		(63	)		(16	)
Warranty provision		45			42
Balance, end of period	$	78		$	74