Note 8 - Commitments and Contingencies (Tables)

6 Months Ended

Jun. 30, 2020

Notes Tables

Schedule of Product Warranty Liability [Table Text Block]

	Three Months Ended June 30,						Six Months Ended June 30,
	2020			2019			2020			2019
Balance at beginning of period	$	1,144		$	2,045		$	1,139		$	4,564
Warranty provision for product sales		499			311			1,040			579
Settlements made		(395	)		(28	)		(506	)		(2,299	)
Unused warranty provision		(74	)		(580	)		(499	)		(1,096	)
Balance at end of period	$	1,174		$	1,748		$	1,174		$	1,748