Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balance at Dec. 26, 2015	$ 96,480	$ 14,180	$ 85,478	$ (3,178)
Balance (in shares) at Dec. 26, 2015		14,180
Other comprehensive income (loss)	(1,102)			(1,102)
Net income	11,493		11,493
Expense of stock options and restricted stock units	398		398
Exercise of stock options	547	$ 96	451
Exercise of stock options (in shares)		96
Settlement of restricted stock units	0	$ 16	(16)
Settlement of restricted stock units (in shares)		16
Tax benefit from settlement of stock compensation	35		35
Dividends declared	(6,282)		(6,282)
Stock issued to directors as compensation	144	$ 13	131
Stock issued to directors as compensation (in shares)		13
Balance at Dec. 31, 2016	101,713	$ 14,305	91,688	(4,280)
Balance (in shares) at Dec. 31, 2016		14,305
Other comprehensive income (loss)	1,670			1,670
Net income	14,061		14,061
Expense of stock options and restricted stock units	522		522
Exercise of stock options	159	$ 28	131
Exercise of stock options (in shares)		28
Settlement of restricted stock units	0	$ 26	(26)
Settlement of restricted stock units (in shares)		26
Dividends declared	(6,607)		(6,607)
Stock issued to directors as compensation	152	$ 13	139
Stock issued to directors as compensation (in shares)		13
Balance at Dec. 30, 2017	111,670	$ 14,372	99,908	(2,610)
Balance (in shares) at Dec. 30, 2017		14,372
Other comprehensive income (loss)	2,610			2,610
Net income	20,442		20,442
Expense of stock options and restricted stock units	604		604
Exercise of stock options	54	$ 9	45
Exercise of stock options (in shares)		9
Settlement of restricted stock units	0	$ 47	(47)
Settlement of restricted stock units (in shares)		47
Dividends declared	(7,215)		(7,215)
Stock issued to directors as compensation	166	$ 12	154
Stock issued to directors as compensation (in shares)		12
Purchase of stock	(10)	$ (1)	(9)
Purchase of stock (in shares)		(1)
Balance at Dec. 29, 2018	$ 128,321	$ 14,439	$ 113,882	$ 0
Balance (in shares) at Dec. 29, 2018		14,439