Note 14 - Segment Information - Results of the Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019	Dec. 28, 2019
Revenues	$ 31,561	$ 40,250	$ 109,246	$ 142,550
Cost of services	22,741	29,635	81,080	106,615
Gross profit	8,820	10,615	28,166	35,935
Selling, general and administrative	8,606	9,498	27,837	30,165
Depreciation and amortization	372	386	1,033	1,191
Operating income (loss)	(158)	731	(9,101)	4,579
Total assets	62,553	91,740	62,553	91,740	$ 96,173
Capital expenditures	249	63	400	301
Write-off of receivables and professional fees incurred related to arbitration			8,397
Engineering [Member]
Revenues	15,087	15,140	43,288	52,778
Cost of services	10,674	10,984	30,673	38,666
Gross profit	4,413	4,156	12,615	14,112
Selling, general and administrative	3,359	2,996	10,073	10,486
Depreciation and amortization	252	293	720	879
Operating income (loss)	802	867	(6,575)	2,747
Total assets	34,961	53,639	34,961	53,639
Capital expenditures	(37)	(11)	(7)	76
Write-off of receivables and professional fees incurred related to arbitration			8,397
Specialty Health Care [Member]
Revenues	9,015	16,765	41,896	64,305
Cost of services	6,724	12,795	33,037	49,395
Gross profit	2,291	3,970	8,859	14,910
Selling, general and administrative	2,989	4,205	10,682	12,990
Depreciation and amortization	82	74	235	250
Operating income (loss)	(780)	(309)	(2,058)	1,670
Total assets	14,349	25,822	14,349	25,822
Capital expenditures	7	2	17	107
Write-off of receivables and professional fees incurred related to arbitration
Information Technology [Member]
Revenues	7,459	8,345	24,062	25,467
Cost of services	5,343	5,856	17,370	18,554
Gross profit	2,116	2,489	6,692	6,913
Selling, general and administrative	2,258	2,297	7,082	6,689
Depreciation and amortization	38	19	78	62
Operating income (loss)	(180)	173	(468)	162
Total assets	7,858	7,773	7,858	7,773
Capital expenditures	8	19	43	36
Write-off of receivables and professional fees incurred related to arbitration
Corporate Segment [Member]
Revenues
Cost of services
Gross profit
Selling, general and administrative
Depreciation and amortization
Operating income (loss)
Total assets	5,385	4,506	5,385	4,506
Capital expenditures	$ 271	$ 53	347	$ 82
Write-off of receivables and professional fees incurred related to arbitration