Note 3 - Revenue Recognition - Revenues Disaggregated by Revenue Source (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017
Revenues	$ 42,559	$ 43,827	$ 145,081	$ 135,680
Engineering Services [Member]
Revenues			62,412	61,517
Health Care [Member]
Revenues			60,599	49,212
Technology Service [Member]
Revenues			22,070	24,951
Time-and-materials Contract [Member] | Engineering Services [Member]
Revenues			56,639	52,843
Time-and-materials Contract [Member] | Health Care [Member]
Revenues			59,457	47,554
Time-and-materials Contract [Member] | Technology Service [Member]
Revenues			21,875	24,671
Fixed-price Contract [Member] | Engineering Services [Member]
Revenues			5,773	8,674
Permanent Placement Services [Member] | Health Care [Member]
Revenues			1,142	1,658
Permanent Placement Services [Member] | Technology Service [Member]
Revenues			$ 195	$ 280