Note 17 - Segment Information (Details) - Summary of Operations Within Geographic Areas Based On Customer Locations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenue distribution
Revenue distribution	$ 144,271	$ 143,036	$ 151,063
HONG KONG
Revenue distribution
Revenue distribution	72,608	79,622	86,090
JAPAN
Revenue distribution
Revenue distribution	26,114	31,261	34,377
Europe [Member]
Revenue distribution
Revenue distribution	8,464	6,787	7,370
UNITED STATES
Revenue distribution
Revenue distribution	3,944	4,702	4,342
CHINA
Revenue distribution
Revenue distribution	10,359	6,568	6,999
TAIWAN, PROVINCE OF CHINA
Revenue distribution
Revenue distribution	16,902	9,077	7,093
Other Geographic Regions [Member]
Revenue distribution
Revenue distribution	$ 5,880	$ 5,019	$ 4,792