Note 20 - Segment Information (Tables)

12 Months Ended

Dec. 31, 2016

Notes Tables

Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]

	Years Ended December 31
	2016		2015		2014
China	$	46,784	$	45,854	$	55,133
Taiwan		3,009		2,274		2,022
Japan		2,535		3,759		4,490
Korea		2,257		879		288
Singapore		1,539		1,398		1,341
Other		437		677		317
	$	56,561	$	54,841	$	63,591

Schedules of Concentration of Risk, by Risk Factor [Table Text Block]

	Years Ended December 31
	2016			2015			2014
Customer A		10	%		11	%		12	%
Customer B		8	%		8	%		10	%

Long-lived Assets by Geographic Areas [Table Text Block]

	December 31
	2016		2015		2014
Taiwan	$	5,607	$	5,813	$	8,689
U.S.A.		4,176		4,162		4,188
China		3,920		3,997		6,363
Other		33		39		123
	$	13,736	$	14,011	$	19,363