Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balance at Dec. 29, 2012	$ 80,457	$ 13,427	$ 62,937	$ 4,093
Balance (in shares) at Dec. 29, 2012		13,427
Other comprehensive income (loss)	826			826
Net income	9,805		9,805
Expense of stock options	557		557
Exercise of stock options	636	$ 184	452
Exercise of stock options (in shares)		184
Settlement of restricted stock units	0	$ 17	(17)
Settlement of restricted stock units (in shares)		17
Tax benefit from settlement of stock compensation	110		110
Dividends declared	(4,622)		(4,622)
Stock issued to directors as compensation	186	$ 29	157
Stock issued to directors as compensation (in shares)		29
Balance at Dec. 28, 2013	87,955	$ 13,657	69,379	4,919
Balance (in shares) at Dec. 28, 2013		13,657
Other comprehensive income (loss)	(6,883)			(6,883)
Net income	11,817		11,817
Expense of stock options	716		716
Exercise of stock options	1,386	$ 301	1,085
Exercise of stock options (in shares)		301
Settlement of restricted stock units	0	$ 34	(34)
Settlement of restricted stock units (in shares)		34
Dividends declared	(5,294)		(5,294)
Stock issued to directors as compensation	82	$ 6	76
Stock issued to directors as compensation (in shares)		6
Balance at Dec. 27, 2014	89,779	$ 13,998	77,745	(1,964)
Balance (in shares) at Dec. 27, 2014		13,998
Other comprehensive income (loss)	(1,214)			(1,214)
Net income	11,606		11,606
Expense of stock options	719		719
Exercise of stock options	937	$ 156	781
Exercise of stock options (in shares)		156
Settlement of restricted stock units	0	$ 19	(19)
Settlement of restricted stock units (in shares)		19
Tax benefit from settlement of stock compensation	701		701
Tax withholding for equity awards	(79)		(79)
Dividends declared	(6,072)		(6,072)
Stock issued to directors as compensation	103	$ 7	96
Stock issued to directors as compensation (in shares)		7
Balance at Dec. 26, 2015	$ 96,480	$ 14,180	$ 85,478	$ (3,178)
Balance (in shares) at Dec. 26, 2015		14,180