Note 7 - Net Income Per Common Share (Details) - Earnings Per Common Share (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 28, 2014	Sep. 29, 2013	Sep. 28, 2014	Sep. 29, 2013
Earnings Per Common Share [Abstract]
Net income for basic and diluted per share calculation (in Dollars)	$ 7,254	$ 5,452	$ 23,381	$ 19,028
Weighted average common shares outstanding - basic	10,657	10,655	10,689	10,759
Effect of potentially dilutive securities	63	42	55	41
Weighted average common shares outstanding - diluted	10,720	10,697	10,744	10,800
Basic net income per common share (in Dollars per share)	$ 0.68	$ 0.51	$ 2.19	$ 1.77
Diluted net income per common share (in Dollars per share)	$ 0.68	$ 0.51	$ 2.18	$ 1.76