Note 14 - Segment Information - Results of the Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2021	Sep. 26, 2020	Oct. 02, 2021	Sep. 26, 2020	Jan. 02, 2021
Revenues	$ 45,471	$ 31,561	$ 138,953	$ 109,246
Cost of services	33,257	22,741	103,623	81,080
Gross profit	12,214	8,820	35,330	28,166
Selling, general and administrative	10,332	8,606	29,396	27,837
Depreciation and amortization of property and equipment	250	292	775	793
Amortization of acquired intangible assets	6	80	95	240
Tax credit professional fees	50	0	170	0
Gain on sale of assets	(2,151)	0	(2,151)	0
Operating income (loss)	3,727	(158)	7,045	(9,101)
Total assets	70,291	62,553	70,291	62,553	$ 68,339
Capital expenditures	358	249	499	400
Write-off of receivables and professional fees incurred related to arbitration	0	0	0	8,397
Engineering [Member]
Revenues	16,482	15,087	47,882	43,288
Cost of services	12,694	10,674	36,875	30,673
Gross profit	3,788	4,413	11,007	12,615
Selling, general and administrative	3,816	3,359	10,512	10,073
Depreciation and amortization of property and equipment	120	172	428	380
Amortization of acquired intangible assets	6	80	95	240
Tax credit professional fees	0		0
Gain on sale of assets	(2,151)		(2,151)
Operating income (loss)	1,997	802	2,123	(6,575)
Total assets	29,020	34,961	29,020	34,961
Capital expenditures	16	(37)	55	(7)
Write-off of receivables and professional fees incurred related to arbitration				8,397
Specialty Health Care [Member]
Revenues	19,646	9,015	63,723	41,896
Cost of services	14,115	6,724	47,564	33,037
Gross profit	5,531	2,291	16,159	8,859
Selling, general and administrative	4,393	2,989	12,858	10,682
Depreciation and amortization of property and equipment	99	82	260	235
Amortization of acquired intangible assets	0	0	0	0
Tax credit professional fees	0		0
Gain on sale of assets	0		0
Operating income (loss)	1,039	(780)	3,041	(2,058)
Total assets	26,483	14,349	26,483	14,349
Capital expenditures	168	7	235	17
Write-off of receivables and professional fees incurred related to arbitration				0
Information Technology [Member]
Revenues	9,343	7,459	27,348	24,062
Cost of services	6,448	5,343	19,184	17,370
Gross profit	2,895	2,116	8,164	6,692
Selling, general and administrative	2,123	2,258	6,026	7,082
Depreciation and amortization of property and equipment	31	38	87	78
Amortization of acquired intangible assets	0	0	0	0
Tax credit professional fees	0		0
Gain on sale of assets	0		0
Operating income (loss)	741	(180)	2,051	(468)
Total assets	8,560	7,858	8,560	7,858
Capital expenditures	35	8	44	43
Write-off of receivables and professional fees incurred related to arbitration				0
Corporate Segment [Member]
Revenues	0	0	0	0
Cost of services	0	0	0	0
Gross profit	0	0	0	0
Selling, general and administrative	0	0	0	0
Depreciation and amortization of property and equipment	0	0	0	0
Amortization of acquired intangible assets	0	0	0	0
Tax credit professional fees	50		170
Gain on sale of assets	0		0
Operating income (loss)	(50)	0	(170)	0
Total assets	6,228	5,385	6,228	5,385
Capital expenditures	$ 139	$ 271	$ 165	347
Write-off of receivables and professional fees incurred related to arbitration				$ 0