Condensed Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 28, 2013	Jun. 29, 2012	Jun. 28, 2013	Jun. 29, 2012
Income Statement [Abstract]
Revenue	$ 107,117	$ 106,705	$ 215,612	$ 210,072
Direct costs	84,470	83,810	170,366	165,325
Selling, general, and administrative expenses	16,248	16,752	32,665	33,005
Operating income	6,399	6,143	12,581	11,742
Interest and other income	9	53	19	97
Non-taxable life insurance proceeds	0	423	0	423
Interest and other expense	115	92	234	186
Income before income taxes	6,293	6,527	12,366	12,076
Provision for income taxes	2,238	2,404	4,254	4,593
Net income	$ 4,055	$ 4,123	$ 8,112	$ 7,483
Net income per share
Earnings per share, basic (in dollars per share)	$ 0.26	$ 0.27	$ 0.53	$ 0.49
Earnings per share, diluted (in dollars per share)	$ 0.24	$ 0.25	$ 0.47	$ 0.45
Weighted average shares outstanding
Basic (in shares)	15,459	15,123	15,445	15,147
Diluted (in shares)	17,098	16,747	17,082	16,810
Cash dividend declared (in dollars per share)	$ 0.05	$ 0.00	$ 0.10	$ 0.00