Note 14 - Segment Information - Results of the Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 03, 2021	Jun. 27, 2020	Jul. 03, 2021	Jun. 27, 2020	Jan. 02, 2021
Revenues	$ 48,933	$ 32,652	$ 93,482	$ 77,685
Cost of services	36,667	24,149	70,366	58,339
Gross profit	12,266	8,503	23,116	19,346
Selling, general and administrative	9,995	8,994	19,064	19,231
Depreciation and amortization of property and equipment	259	246	525	501
Amortization of acquired intangible assets	9	80	89	160
Tax credit professional fees	60	0	120	0
Operating income (loss)	1,943	(1,167)	3,318	(8,943)
Total assets	64,697	70,178	64,697	70,178	$ 68,339
Capital expenditures	94	116	141	151
Write-off of receivables and professional fees incurred related to arbitration	0	350	0	8,397
Engineering [Member]
Revenues	16,934	14,038	31,400	28,201
Cost of services	12,920	9,804	24,180	20,001
Gross profit	4,014	4,234	7,220	8,200
Selling, general and administrative	3,625	3,349	6,697	6,723
Depreciation and amortization of property and equipment	153	154	308	312
Amortization of acquired intangible assets	9	80	89	160
Tax credit professional fees	0		0
Operating income (loss)	227	301	126	(7,392)
Total assets	30,050	40,699	30,050	40,699
Capital expenditures	30	21	39	30
Write-off of receivables and professional fees incurred related to arbitration		350		8,397
Specialty Health Care [Member]
Revenues	22,941	10,684	44,077	32,881
Cost of services	17,349	8,487	33,448	26,311
Gross profit	5,592	2,197	10,629	6,570
Selling, general and administrative	4,399	3,208	8,464	7,682
Depreciation and amortization of property and equipment	80	70	161	147
Amortization of acquired intangible assets	0	0	0	0
Tax credit professional fees	0		0
Operating income (loss)	1,113	(1,081)	2,004	(1,259)
Total assets	20,064	15,570	20,064	15,570
Capital expenditures	39	0	67	10
Write-off of receivables and professional fees incurred related to arbitration		0		0
Information Technology [Member]
Revenues	9,058	7,930	18,005	16,603
Cost of services	6,398	5,858	12,738	12,027
Gross profit	2,660	2,072	5,267	4,576
Selling, general and administrative	1,971	2,437	3,903	4,826
Depreciation and amortization of property and equipment	26	22	56	42
Amortization of acquired intangible assets	0	0	0	0
Tax credit professional fees	0		0
Operating income (loss)	663	(387)	1,308	(292)
Total assets	8,187	7,815	8,187	7,815
Capital expenditures	3	20	9	35
Write-off of receivables and professional fees incurred related to arbitration		0		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	60		120
Operating income (loss)	(60)	0	(120)	0
Total assets	6,396	6,094	6,396	6,094
Capital expenditures	$ 22	75	$ 26	76
Write-off of receivables and professional fees incurred related to arbitration		$ 0		$ 0