Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2023	Sep. 30, 2022	Sep. 29, 2023	Sep. 30, 2022
Revenue:
Revenue	$ 75,856	$ 72,033	$ 224,187	$ 223,625
Cost of service:
Total cost of service	45,643	43,908	137,071	137,658
Selling, general and administrative costs (includes $1,193 and $3,243 and $859 and $3,027 of non-cash stock based compensation expense in the three and nine months ended September 29, 2023 and September 30, 2022, respectively)	16,470	14,616	49,331	44,993
Restructuring and asset impairment settlement		(526)		(651)
Total costs and operating expenses	62,113	57,998	186,402	182,000
Income from operations	13,743	14,035	37,785	41,625
Other expense, net:
Interest expense, net	(814)	(14)	(2,594)	(70)
Income from operations before income taxes	12,929	14,021	35,191	41,555
Income tax expense	3,509	3,655	8,890	10,469
Net income	$ 9,420	$ 10,366	$ 26,301	$ 31,086
Basic net income per common share:
Income per common share from operations	$ 0.35	$ 0.33	$ 0.97	$ 0.98
Weighted average common shares outstanding	27,220,176	31,685,621	27,146,095	31,595,814
Diluted net income per common share:
Income per common share from operations	$ 0.34	$ 0.32	$ 0.95	$ 0.97
Weighted average common and common equivalent shares outstanding	27,817,949	32,308,514	27,544,738	32,124,371
Revenue Before Reimbursements [Member]
Revenue:
Revenue	$ 74,634	$ 70,995	$ 220,106	$ 220,871
Reimbursements [Member]
Revenue:
Revenue	1,222	1,038	4,081	2,754
Cost of service:
Total cost of service	1,222	1,038	4,081	2,754
Cost Before Reimbursements [Member]
Cost of service:
Total cost of service	$ 44,421	$ 42,870	$ 132,990	$ 134,904