Note 3 - Revenue Recognition - Revenues Disaggregated by Revenue Source (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2023	Jul. 02, 2022	Jul. 01, 2023	Jul. 02, 2022
Revenue	$ 67,035	$ 74,346	$ 134,159	$ 156,307
Health Care [Member]
Revenue	35,528	43,457	74,658	95,641
Engineering Services [Member]
Revenue	21,014	20,906	39,504	40,804
Technology Service [Member]
Revenue	10,493	9,983	19,997	19,862
Time-and-Materials Contract [Member] | Health Care [Member]
Revenue	35,276	43,045	74,110	95,068
Time-and-Materials Contract [Member] | Engineering Services [Member]
Revenue	11,557	11,471	22,027	22,146
Time-and-Materials Contract [Member] | Technology Service [Member]
Revenue	8,624	9,101	16,858	18,257
Permanent Placement Services [Member] | Health Care [Member]
Revenue	252	412	548	573
Permanent Placement Services [Member] | Technology Service [Member]
Revenue	133	695	247	1,241
Fixed-Price Contract [Member] | Engineering Services [Member]
Revenue	9,457	9,435	17,477	18,658
Fixed-Price Contract [Member] | Technology Service [Member]
Revenue	$ 1,736	$ 187	$ 2,892	$ 364