Note 17 - Segment and Geographic Information - Net Sales by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 01, 2017	Dec. 27, 2015	Jan. 01, 2017	Dec. 27, 2015
Net sales	$ 27,222	$ 25,310	$ 81,959	$ 76,248
CHINA
Net sales	10,714	9,241	34,089	28,096
UNITED STATES
Net sales	4,922	5,059	14,550	13,416
SINGAPORE
Net sales	3,525	3,255	10,234	10,740
GERMANY
Net sales	2,717	2,992	7,433	9,951
TAIWAN, PROVINCE OF CHINA
Net sales	1,434	1,873	5,381	5,219
KOREA, REPUBLIC OF
Net sales	539	259	1,846	1,227
Rest of the World [Member]
Net sales	$ 3,371	$ 2,631	$ 8,426	$ 7,599