Note 8 - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 02, 2016	Mar. 28, 2015
Net income	$ 19,289	$ 19,995
Basic (in shares)	22,438	22,600
Net effect of dilutive stock options and restricted share units (in shares)	183	181
Average shares - Diluted (in shares)	22,621	22,781
Net income per share (see note 8):
Basic (in dollars per share)	$ 0.86	$ 0.88
Diluted (in dollars per share)	$ 0.85	$ 0.88