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Note 3 - Revenue Recognition - Revenues Disaggregated by Revenue Source (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 03, 2021	Jun. 27, 2020	Jul. 03, 2021	Jun. 27, 2020
Revenue	$ 48,933	$ 32,652	$ 93,482	$ 77,685
Engineering Services [Member]
Revenue	16,934	14,038	31,400	28,201
Health Care [Member]
Revenue	22,941	10,684	44,077	32,881
Technology Service [Member]
Revenue	9,058	7,930	18,005	16,603
Time-and-materials Contract [Member] | Engineering Services [Member]
Revenue	11,821	10,784	22,299	23,611
Time-and-materials Contract [Member] | Health Care [Member]
Revenue	22,729	10,601	43,661	32,654
Time-and-materials Contract [Member] | Technology Service [Member]
Revenue	8,864	7,779	17,661	16,336
Fixed-price Contract [Member] | Engineering Services [Member]
Revenue	5,113	3,189	9,034	4,503
Permanent Placement Services [Member] | Engineering Services [Member]
Revenue	0	65	67	87
Permanent Placement Services [Member] | Health Care [Member]
Revenue	212	83	416	227
Permanent Placement Services [Member] | Technology Service [Member]
Revenue	$ 194	$ 151	$ 344	$ 267

X

- Definition

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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