Consolidated Statements of Net Income and Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Lessee, Lease, Description [Line Items]
Gross revenues	$ 131,032	$ 104,185	$ 376,340	$ 302,737
Direct costs (excluding depreciation and amortization):
Salaries and wages	40,426	34,475	113,762	98,542
Sub-consultant services	19,972	14,989	56,969	43,349
Other direct costs	7,139	4,747	25,244	13,539
Total direct costs	67,536	54,211	195,975	155,430
Gross Profit	63,496	49,974	180,365	147,307
Operating Expenses:
Salaries and wages, payroll taxes and benefits	33,428	24,897	93,431	76,122
General and administrative	11,028	7,556	30,786	23,348
Facilities and facilities related		3,490		10,552
Depreciation and amortization	6,551	4,057	18,908	11,660
Total operating expenses	55,671	40,000	155,533	121,682
Income from operations	7,825	9,974	24,832	25,625
Interest expense	(421)	(451)	(1,230)	(1,712)
Income before income tax expense	7,403	9,523	23,602	23,913
Income tax expense	(1,560)	(2,238)	(3,422)	(4,716)
Net Income and Comprehensive Income	$ 5,843	$ 7,285	$ 20,180	$ 19,197
Earnings per share:
Basic (USD per Share)	$ 0.48	$ 0.65	$ 1.67	$ 1.80
Diluted (USD per Share)	$ 0.46	$ 0.62	$ 1.62	$ 1.71
Weighted average common shares outstanding:
Basic (in shares)	12,191,405	11,256,946	12,086,588	10,686,040
Diluted (in shares)	12,566,966	11,701,394	12,485,049	11,205,748
Facilities and facilities related
Operating Expenses:
Facilities and facilities related	$ 4,664		$ 12,407