Note 7 - Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2018

Notes Tables

Schedule of Rent Expense [Table Text Block]

	Year ended December 31,
	2018		2017		2016
			(in thousands)
Rent expense	$	2,090	$	2,190	$	1,580

Contractual Obligation, Fiscal Year Maturity Schedule [Table Text Block]

			Less than		1-3		3-5		More than
Contractual obligations	Total		1 year		years		years		5 years
	(in thousands)
Operating leases	$	7,435	$	1,826	$	3,053	$	2,556	$	-
Inventory purchase commitments	$	2,195	$	2,072	$	123	$	-	$	-