Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 27, 2019	Sep. 28, 2018	Sep. 27, 2019	Sep. 28, 2018
Revenue:
Total revenue	$ 72,690	$ 73,718	$ 213,366	$ 219,352
Cost of service:
Total cost of service	48,273	48,304	140,379	143,877
Stock compensation expense	1,155	1,646	3,465	4,367
Selling, general and administrative costs	14,353	15,507	44,107	45,953
Stock compensation expense	776	850	2,268	2,495
Change in acquisition-related contingent consideration liability	(108)	803	(1,133)	(3,750)
Total costs and operating expenses	63,294	65,464	185,621	188,575
Income from operations	9,396	8,254	27,745	30,777
Other expense:
Interest expense	(62)	(158)	(268)	(515)
Income from operations before income taxes	9,334	8,096	27,477	30,262
Income tax expense	2,427	2,425	6,481	5,618
Income from continuing operations	6,907	5,671	20,996	24,644
Income (loss) from discontinued operations	2	(514)	(4)	(599)
Net income	$ 6,909	$ 5,157	$ 20,992	$ 24,045
Basic net income per common share:
Income per common share from continuing operations	$ 0.23	$ 0.19	$ 0.70	$ 0.84
Income (loss) per common share from discontinued operations	0.00	(0.02)	0.00	(0.02)
Basic net income per common share	0.23	0.17	0.70	0.82
Diluted net income per common share:
Income per common share from continuing operations	0.21	0.18	0.65	0.77
Income (loss) per common share from discontinued operations	0.00	(0.02)	0.00	(0.02)
Diluted net income per common share	$ 0.21	$ 0.16	$ 0.65	$ 0.75
Weighted average common shares outstanding:
Basic	29,876,468	29,478,243	29,794,091	29,332,508
Diluted	32,570,742	32,593,359	32,413,115	32,214,419
Revenue Before Reimbursements [Member]
Revenue:
Total revenue	$ 66,755	$ 68,183	$ 197,101	$ 202,928
Reimbursements [Member]
Revenue:
Total revenue	5,935	5,535	16,265	16,424
Cost of service:
Total cost of service	5,935	5,535	16,265	16,424
Cost Before Reimbursements [Member]
Cost of service:
Total cost of service	$ 41,183	$ 41,123	$ 120,649	$ 123,086