Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 02, 2021	Jun. 26, 2020	Jul. 02, 2021	Jun. 26, 2020
Income Statement [Abstract]
Revenue	$ 92,164	$ 89,146	$ 189,293	$ 176,095
Cost of services	71,785	70,408	148,147	140,311
Gross profit	20,379	18,738	41,146	35,784
Selling, general and administrative expenses	17,578	16,824	36,247	31,803
Operating income	2,801	1,914	4,899	3,981
Interest and other income	110	131	194	134
Gain on sale of building		824		824
Non-taxable life insurance gain		389		389
Interest and other expense	366	136	600	330
Income before income taxes	2,545	3,122	4,493	4,998
Provision for income taxes	712	1,363	1,152	2,095
Net income	$ 1,833	$ 1,759	$ 3,341	$ 2,903
Net income per share:
Basic	$ 0.13	$ 0.13	$ 0.24	$ 0.21
Diluted	$ 0.12	$ 0.12	$ 0.22	$ 0.20
Weighted average shares outstanding:
Basic	13,845	13,605	13,770	13,576
Diluted	14,972	14,282	14,958	14,299