Note 13 - Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2017

Notes Tables

Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]

2018	$	1,210
2019		636
2020		193
2021		55
2022		51
Total	$	2,145

Schedule of Product Warranty Liability [Table Text Block]

	Year Ended December 31,
	2017			2016			2015
Balance at beginning of period	$	1,030		$	289		$	240
Warranty provision for product sales		1,912			1,102			333
Settlements made		(40	)		(68	)		(158	)
Unused warranty provision		(486	)		(293	)		(126	)
Balance at end of period	$	2,416		$	1,030		$	289