Consolidated Statements of Net Income and Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018
Lessee, Lease, Description [Line Items]
Gross revenues	$ 127,974	$ 104,018	$ 245,309	$ 198,552
Direct costs (excluding depreciation and amortization):
Salaries and wages	38,080	33,546	73,337	64,067
Sub-consultant services	20,044	14,900	36,996	28,360
Other direct costs	8,410	4,870	18,106	8,792
Total direct costs	66,534	53,316	128,439	101,219
Gross Profit	61,440	50,702	116,870	97,333
Operating Expenses:
Salaries and wages, payroll taxes and benefits	30,765	25,767	60,004	51,225
General and administrative	10,896	8,258	19,758	15,792
Facilities and facilities related		3,520		7,062
Depreciation and amortization	6,245	3,807	12,357	7,603
Total operating expenses	51,843	41,352	99,862	81,682
Income from operations	9,597	9,350	17,008	15,651
Interest expense	(457)	(650)	(808)	(1,261)
Income before income tax expense	9,140	8,700	16,200	14,390
Income tax expense	(346)	(1,080)	(1,863)	(2,478)
Net Income and Comprehensive Income	$ 8,794	$ 7,620	$ 14,337	$ 11,912
Earnings per share:
Basic (in shares)	$ 0.73	$ 0.73	$ 1.19	$ 1.15
Diluted (in shares)	$ 0.70	$ 0.69	$ 1.15	$ 1.09
Weighted average common shares outstanding:
Basic (in shares)	12,106,066	10,496,524	12,033,906	10,395,874
Diluted (in shares)	12,521,463	11,004,212	12,447,248	10,953,259
Facilities and facilities related
Operating Expenses:
Facilities and facilities related	$ 3,937		$ 7,743