Note 3 - Revenue Recognition - Revenues Disaggregated by Revenue Source (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2024	Apr. 01, 2023
Revenue	$ 71,939	$ 67,124
Health Care [Member]
Revenue	38,182	39,130
Engineering Services [Member]
Revenue	23,505	18,490
Technology Service [Member]
Revenue	10,252	9,504
Time-and-Materials Contract [Member] | Health Care [Member]
Revenue	37,804	38,834
Time-and-Materials Contract [Member] | Engineering Services [Member]
Revenue	11,242	10,470
Time-and-Materials Contract [Member] | Technology Service [Member]
Revenue	9,133	8,234
Permanent Placement Services [Member] | Health Care [Member]
Revenue	378	296
Permanent Placement Services [Member] | Technology Service [Member]
Revenue	73	114
Fixed-Price Contract [Member] | Engineering Services [Member]
Revenue	12,263	8,020
Fixed-Price Contract [Member] | Technology Service [Member]
Revenue	$ 1,046	$ 1,156