Note 1 - Description of Business and Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2020

Notes Tables

Schedule of Product Warranty Liability [Table Text Block]

	As of December 31,
	2020			2019
Balance, beginning of period	$	163		$	226
Reduction of warranty reserve		(78	)		(32	)
Warranty claims		(52	)		(21	)
Other adjustments		—			(10	)
Balance, end of period	$	33		$	163