Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2019	Jun. 29, 2018	Jun. 28, 2019	Jun. 29, 2018
Revenue:
Total revenue	$ 73,521	$ 74,527	$ 140,676	$ 145,634
Cost of service:
Total cost of service	47,517	48,663	92,106	95,573
Stock compensation expense	1,311	898	2,310	2,721
Selling, general and administrative costs	15,413	15,370	29,754	30,446
Stock compensation expense	787	804	1,492	1,645
Acquisition-related contingent consideration liability	45	(4,553)	(1,025)	(4,553)
Total costs and operating expenses	63,762	60,284	122,327	123,111
Income from operations	9,759	14,243	18,349	22,523
Other expense:
Interest expense	(105)	(178)	(206)	(357)
Income from operations before income taxes	9,654	14,065	18,143	22,166
Income tax expense	2,614	2,393	4,054	3,193
Income from continuing operations	7,040	11,672	14,089	18,973
Loss from discontinued operations	(51)	(151)	(6)	(85)
Net income	$ 6,989	$ 11,521	$ 14,083	$ 18,888
Basic net income per common share:
Income per common share from continuing operations	$ 0.23	$ 0.40	$ 0.47	$ 0.65
Loss per common share from discontinued operations	0.00	(0.01)	0.00	0.00
Net income per common share	0.23	0.39	0.47	0.65
Diluted net income per common share:
Income per common share from continuing operations	0.22	0.36	0.44	0.59
Loss per common share from discontinued operations	0.00	0.00	0.00	0.00
Net income per common share	$ 0.22	$ 0.36	$ 0.44	$ 0.59
Weighted average common shares outstanding:
Basic	29,822,917	29,429,925	29,752,903	29,259,641
Diluted	32,374,152	32,235,085	32,334,301	32,024,949
Revenue Before Reimbursements [Member]
Revenue:
Total revenue	$ 67,976	$ 68,706	$ 130,346	$ 134,745
Reimbursements [Member]
Revenue:
Total revenue	5,545	5,821	10,330	10,889
Cost of service:
Total cost of service	5,545	5,821	10,330	10,889
Cost Before Reimbursements [Member]
Cost of service:
Total cost of service	$ 40,661	$ 41,944	$ 79,466	$ 81,963