Note 3 - Revenue Recognition - Revenues Disaggregated by Revenue Source (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Apr. 01, 2017
Revenues	$ 50,812	$ 46,341
Engineering Services [Member]
Revenues	21,418	19,224
Health Care [Member]
Revenues	22,634	18,507
Technology Service [Member]
Revenues	6,760	8,610
Time-and-materials Contract [Member] | Engineering Services [Member]
Revenues	18,655	16,698
Time-and-materials Contract [Member] | Health Care [Member]
Revenues	22,113	17,881
Time-and-materials Contract [Member] | Technology Service [Member]
Revenues	6,668	8,516
Fixed-price Contract [Member] | Engineering Services [Member]
Revenues	2,763	2,526
Permanent Placement Services [Member] | Health Care [Member]
Revenues	521	626
Permanent Placement Services [Member] | Technology Service [Member]
Revenues	$ 92	$ 94