CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid in Capital	Accumulated Other Comprehensive Loss	Retained Earnings
Balance, beginning (in shares) at Dec. 26, 2014		25,031,267
Balance, beginning at Dec. 26, 2014	$ 146,794	$ 250	$ 97,966	$ (693)	$ 49,271
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	16,209				16,209
Shares issued for acquisition (in shares)		1,113,636
Shares issued for acquisition	24,689	$ 11	24,678
Stock compensation (in shares)		196,950
Stock compensation	3,539	$ 2	3,537
Excess tax benefits on stock compensation	81		81
Cumulative translation adjustment	(2,256)			(2,256)
Shares surrendered to pay withholding taxes (in shares)		(51,178)
Shares surrendered to pay withholding taxes	(1,092)		(1,092)
Balance, ending (in shares) at Dec. 25, 2015		26,290,675
Balance, ending at Dec. 25, 2015	187,964	$ 263	125,170	(2,949)	65,480
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	3,023				3,023
Stock compensation (in shares)		25,895
Stock compensation	2,579	$ 0	2,579
Cumulative translation adjustment	763			763
Shares surrendered to pay withholding taxes (in shares)		(36,101)
Shares surrendered to pay withholding taxes	$ (569)		(569)
Balance, ending (in shares) at Dec. 30, 2016	26,280,469	26,280,469
Balance, ending at Dec. 30, 2016	$ 193,760	$ 263	127,180	(2,186)	68,503
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	14,366				14,366
Shares issued for acquisition (in shares)		185,442
Shares issued for acquisition	3,300	$ 2	3,298
Stock compensation (in shares)		110,331
Stock compensation	3,018		3,018
Public offering of common stock (in shares)		1,900,000
Public offering of common stock	34,020	$ 19	34,001
Cumulative translation adjustment	637			637
Shares surrendered to pay withholding taxes (in shares)		(34,034)
Shares surrendered to pay withholding taxes	$ (500)	$ 0	(500)
Balance, ending (in shares) at Dec. 29, 2017	28,442,208	28,442,208
Balance, ending at Dec. 29, 2017	$ 248,601	$ 284	$ 166,997	$ (1,549)	$ 82,869