Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2021	Sep. 25, 2020	Oct. 01, 2021	Sep. 25, 2020
Revenue:
Total revenue	$ 71,894	$ 57,917	$ 208,577	$ 180,201
Cost of service:
Stock compensation expense	1,670	1,751	5,296	5,204
Total cost of service	45,716	39,700	130,389	127,415
Selling, general and administrative costs	13,872	12,979	41,198	38,765
Stock compensation expense	901	711	2,515	1,830
Restructuring costs				5,034
Total costs and operating expenses	60,489	53,390	174,102	173,044
Income from operations	11,405	4,527	34,475	7,157
Other expense:
Interest expense	(26)	(22)	(76)	(100)
Income from operations before income taxes	11,379	4,505	34,399	7,057
Income tax expense	3,248	1,362	9,368	2,312
Income from continuing operations	8,131	3,143	25,031	4,745
Loss from discontinued operations		(157)	(7)	(165)
Net income	$ 8,131	$ 2,986	$ 25,024	$ 4,580
Basic net income per common share:
Income per common share from continuing operations	$ 0.27	$ 0.11	$ 0.83	$ 0.16
Loss per common share from discontinued operations	0.00	(0.01)	0.00	(0.01)
Net income per common share	0.27	0.10	0.83	0.15
Diluted net income per common share:
Income per common share from continuing operations	0.25	0.10	0.76	0.15
Loss per common share from discontinued operations	0.00	(0.01)	0.00	(0.01)
Net income per common share	$ 0.25	$ 0.09	$ 0.76	$ 0.14
Weighted average common shares outstanding:
Basic	29,813,530	30,053,457	30,038,249	29,985,879
Diluted	32,875,810	32,403,442	32,871,382	32,334,552
Revenue Before Reimbursements [Member]
Revenue:
Total revenue	$ 71,400	$ 57,769	$ 207,807	$ 175,587
Reimbursements [Member]
Revenue:
Total revenue	494	148	770	4,614
Cost of service:
Reimbursable expenses	494	148	770	4,614
Cost Before Reimbursements [Member]
Cost of service:
Personnel costs before reimbursable expenses	$ 43,552	$ 37,801	$ 124,323	$ 117,597