Note 18 - Segment and Geographic Information (Details) - Net Sales by Geographic Area - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 27, 2015	Sep. 28, 2014	Sep. 27, 2015	Sep. 28, 2014
Note 18 - Segment and Geographic Information (Details) - Net Sales by Geographic Area [Line Items]
Net sales	$ 34,742	$ 43,159	$ 75,164	$ 73,878
CHINA
Note 18 - Segment and Geographic Information (Details) - Net Sales by Geographic Area [Line Items]
Net sales	17,898	16,738	32,822	27,497
TAIWAN, PROVINCE OF CHINA
Note 18 - Segment and Geographic Information (Details) - Net Sales by Geographic Area [Line Items]
Net sales	3,881	5,826	8,968	7,236
UNITED STATES
Note 18 - Segment and Geographic Information (Details) - Net Sales by Geographic Area [Line Items]
Net sales	1,782	5,012	8,397	11,239
SINGAPORE
Note 18 - Segment and Geographic Information (Details) - Net Sales by Geographic Area [Line Items]
Net sales	3,300	3,605	7,485	7,195
GERMANY
Note 18 - Segment and Geographic Information (Details) - Net Sales by Geographic Area [Line Items]
Net sales	3,286	3,055	6,959	6,012
KOREA, REPUBLIC OF
Note 18 - Segment and Geographic Information (Details) - Net Sales by Geographic Area [Line Items]
Net sales	1,872	5,126	4,840	7,254
Rest Of World [Member]
Note 18 - Segment and Geographic Information (Details) - Net Sales by Geographic Area [Line Items]
Net sales	$ 2,723	$ 3,797	$ 5,693	$ 7,445