Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 27, 2020	Mar. 29, 2019
Revenue:
Total revenue	$ 69,533	$ 67,155
Cost of service:
Total cost of service	47,054	44,589
Stock compensation expense	1,594	999
Selling, general and administrative costs	14,135	14,341
Stock compensation expense	636	705
Acquisition-related contingent consideration liability		(1,070)
Total costs and operating expenses	61,825	58,565
Income from operations	7,708	8,590
Other expense:
Interest expense	(37)	(101)
Income from operations before income taxes	7,671	8,489
Income tax expense	2,136	1,440
Income from continuing operations	5,535	7,049
Gain (loss) from discontinued operations	(8)	45
Net income	$ 5,527	$ 7,094
Basic net income per common share:
Income per common share from continuing operations	$ 0.19	$ 0.24
Gain (loss) per common share from discontinued operations	0.00	0.00
Net income per common share	0.19	0.24
Diluted net income per common share:
Income per common share from continuing operations	0.17	0.22
Gain (loss) per common share from discontinued operations	0.00	0.00
Net income per common share	$ 0.17	$ 0.22
Weighted average common shares outstanding:
Basic	29,889,142	29,682,888
Diluted	32,264,007	32,294,450
Revenue Before Reimbursements [Member]
Revenue:
Total revenue	$ 65,186	$ 62,370
Reimbursements [Member]
Revenue:
Total revenue	4,347	4,785
Cost of service:
Total cost of service	4,347	4,785
Cost Before Reimbursements [Member]
Cost of service:
Total cost of service	$ 41,113	$ 38,805