Note 16 - Segment and Geographic Information (Details) - Revenue By Region (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Note 16 - Segment and Geographic Information (Details) - Revenue By Region [Line Items]
Region	$ 282,535,000	$ 238,091,000	$ 213,813,000
CHINA
Note 16 - Segment and Geographic Information (Details) - Revenue By Region [Line Items]
Region	181,050,000	141,400,000	124,278,000
TAIWAN, PROVINCE OF CHINA
Note 16 - Segment and Geographic Information (Details) - Revenue By Region [Line Items]
Region	38,460,000	34,248,000	27,477,000
Europe [Member]
Note 16 - Segment and Geographic Information (Details) - Revenue By Region [Line Items]
Region	19,830,000	15,351,000	16,201,000
KOREA, DEMOCRATIC PEOPLE'S REPUBLIC OF
Note 16 - Segment and Geographic Information (Details) - Revenue By Region [Line Items]
Region	14,362,000	9,992,000	9,434,000
South East Asia [Member]
Note 16 - Segment and Geographic Information (Details) - Revenue By Region [Line Items]
Region	13,993,000	21,760,000	21,641,000
JAPAN
Note 16 - Segment and Geographic Information (Details) - Revenue By Region [Line Items]
Region	8,251,000	7,495,000	8,516,000
UNITED STATES
Note 16 - Segment and Geographic Information (Details) - Revenue By Region [Line Items]
Region	6,392,000	7,525,000	5,711,000
Other Region [Member]
Note 16 - Segment and Geographic Information (Details) - Revenue By Region [Line Items]
Region	$ 197,000	$ 320,000	$ 555,000