Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings
Beginning Balance (in shares) at Dec. 30, 2017		10,834,770
Beginning Balance at Dec. 30, 2017	$ 180,097	$ 108	$ 125,954	$ 54,035
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock compensation	4,541		4,541
Restricted stock issuance, net (in shares)		144,118
Restricted stock issuance, net		$ 2	(2)
Stock issuance for acquisitions (in shares)		73,012
Stock issuance for acquisitions	4,950	$ 1	4,949
Proceeds from secondary offering, net of costs (in shares)		1,270,000
Proceeds from secondary offering, net of costs	93,469	$ 13	93,456
Proceeds from exercise of warrants, net of costs (in shares)		140,000
Proceeds from exercise of warrants, net of costs	1,092	$ 1	1,091
Net income	19,197			19,197
Ending Balance (in shares) at Sep. 29, 2018		12,461,900
Ending Balance at Sep. 29, 2018	303,346	$ 125	229,989	73,232
Beginning Balance (in shares) at Jun. 30, 2018		11,129,082
Beginning Balance at Jun. 30, 2018	197,804	$ 111	131,746	65,947
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock compensation	1,902		1,902
Restricted stock issuance, net (in shares)		25,672
Restricted stock issuance, net		$ 0	(1)
Stock issuance for acquisitions (in shares)		37,146
Stock issuance for acquisitions	2,886	$ 0	2,886
Proceeds from secondary offering, net of costs (in shares)		1,270,000
Proceeds from secondary offering, net of costs	93,469	$ 13	93,456
Net income	7,285			7,285
Ending Balance (in shares) at Sep. 29, 2018		12,461,900
Ending Balance at Sep. 29, 2018	303,346	$ 125	229,989	73,232
Beginning Balance (in shares) at Dec. 29, 2018		12,550,711
Beginning Balance at Dec. 29, 2018	317,542	$ 126	236,525	80,891
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock compensation	6,989		6,989
Restricted stock issuance, net (in shares)		215,431
Restricted stock issuance, net		$ 2	(2)
Stock issuance for acquisitions (in shares)		41,592
Stock issuance for acquisitions	2,632	$ 0	2,632
Net income	$ 20,180			20,180
Payment of contingent consideration with common stock (in shares)	11,185
Payment of contingent consideration with common stock	$ 725	$ 0	725
Ending Balance (in shares) at Sep. 28, 2019		12,818,919
Ending Balance at Sep. 28, 2019	348,067	$ 128	246,869	101,070
Beginning Balance (in shares) at Jun. 29, 2019		12,657,841
Beginning Balance at Jun. 29, 2019	339,001	$ 127	243,646	95,228
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock compensation	2,819		2,819
Restricted stock issuance, net (in shares)		155,307
Restricted stock issuance, net	1	$ 1	0
Stock issuance for acquisitions (in shares)		5,771
Stock issuance for acquisitions	403	$ 0	403
Net income	5,843			5,843
Ending Balance (in shares) at Sep. 28, 2019		12,818,919
Ending Balance at Sep. 28, 2019	$ 348,067	$ 128	$ 246,869	$ 101,070