Note 10 - Segment Information - Revenues and Long-lived Assets by Geographical Area (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 01, 2017	Apr. 02, 2016	Dec. 31, 2016
Net sales	$ 285,441	$ 219,398
Long-lived assets	223,942		$ 217,175
Additions to long-lived assets	12,377	9,139
UNITED STATES
Net sales	86,658	85,149
Long-lived assets	23,770		23,731
Additions to long-lived assets	332	1,618
CHINA
Net sales	74,690	48,509
Long-lived assets	65,073		65,345
Additions to long-lived assets	2,341	1,046
Other Countries [Member]
Net sales	124,093	85,740
Long-lived assets	44,373		42,492
Additions to long-lived assets	1,871	721
MEXICO
Long-lived assets	58,111		52,262
Additions to long-lived assets	6,978	4,653
PHILIPPINES
Long-lived assets	32,615		$ 33,345
Additions to long-lived assets	$ 855	$ 1,101