Note 13 - Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2019

Notes Tables

Schedule of Product Warranty Liability [Table Text Block]

	Year Ended December 31,
	2019			2018			2017
Balance at beginning of period	$	4,564		$	2,416		$	1,030
Warranty provision for product sales		891			6,586			1,912
Settlements made		(2,768	)		(1,402	)		(40	)
Unused warranty provision		(1,548	)		(3,036	)		(486	)
Balance at end of period	$	1,139		$	4,564		$	2,416