Note 3 - Revenue Recognition - Revenues Disaggregated by Revenue Source (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Revenues	$ 40,250	$ 42,559	$ 142,550	$ 145,081
Engineering Services [Member]
Revenues	15,140	19,424	52,778	62,412
Health Care [Member]
Revenues	16,765	15,107	64,305	60,599
Technology Service [Member]
Revenues	8,345	8,028	25,467	22,070
Time-and-materials Contract [Member] | Engineering Services [Member]
Revenues	13,938	17,601	41,309	56,639
Time-and-materials Contract [Member] | Health Care [Member]
Revenues	16,272	14,760	63,318	59,457
Time-and-materials Contract [Member] | Technology Service [Member]
Revenues	8,134	7,925	25,084	21,875
Fixed-price Contract [Member] | Engineering Services [Member]
Revenues	1,202	1,823	11,469	5,773
Permanent Placement Services [Member] | Engineering Services [Member]
Revenues
Permanent Placement Services [Member] | Health Care [Member]
Revenues	493	347	987	1,142
Permanent Placement Services [Member] | Technology Service [Member]
Revenues	$ 211	$ 103	$ 383	$ 195