Note 3 - Revenue Recognition - Revenues Disaggregated by Revenue Source (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018
Revenues	$ 50,705	$ 51,710	$ 102,300	$ 102,522
Engineering Services [Member]
Revenues	18,583	21,571	37,638	42,988
Health Care [Member]
Revenues	23,370	22,858	47,540	45,492
Technology Service [Member]
Revenues	8,752	7,281	17,122	14,042
Time-and-materials Contract [Member] | Engineering Services [Member]
Revenues	13,528	19,220	27,371	38,460
Time-and-materials Contract [Member] | Health Care [Member]
Revenues	23,140	22,584	47,046	44,697
Time-and-materials Contract [Member] | Technology Service [Member]
Revenues	8,641	7,281	16,950	13,950
Fixed-price Contract [Member] | Engineering Services [Member]
Revenues	5,098	2,351	10,267	4,528
Permanent Placement Services [Member] | Engineering Services [Member]
Revenues	(43)
Permanent Placement Services [Member] | Health Care [Member]
Revenues	230	274	494	795
Permanent Placement Services [Member] | Technology Service [Member]
Revenues	$ 111		$ 172	$ 92