Note 3 - Revenue Recognition - Revenues Disaggregated by Revenue Source (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018
Revenues	$ 51,595	$ 50,812
Engineering Services [Member]
Revenues	19,055	21,418
Health Care [Member]
Revenues	24,171	22,634
Technology Service [Member]
Revenues	8,369	6,760
Time-and-materials Contract [Member] | Engineering Services [Member]
Revenues	13,843	18,655
Time-and-materials Contract [Member] | Health Care [Member]
Revenues	23,907	22,113
Time-and-materials Contract [Member] | Technology Service [Member]
Revenues	8,308	6,668
Fixed-price Contract [Member] | Engineering Services [Member]
Revenues	5,169	2,763
Permanent Placement Services [Member] | Engineering Services [Member]
Revenues	43
Permanent Placement Services [Member] | Health Care [Member]
Revenues	264	521
Permanent Placement Services [Member] | Technology Service [Member]
Revenues	$ 61	$ 92