Note 13 - Segment Information - Results of the Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2023	Jul. 02, 2022	Jul. 01, 2023	Jul. 02, 2022	Dec. 31, 2022
Revenues	$ 67,035	$ 74,346	$ 134,159	$ 156,307
Cost of services	48,275	52,663	96,375	111,204
Gross profit	18,760	21,683	37,784	45,103
Selling, general and administrative	12,723	13,264	26,119	27,411
Depreciation and amortization of property and equipment	242	225	513	463
Amortization of acquired intangible assets	46	0	91	0
Operating income	5,749	8,194	11,456	17,229
Total assets	105,537	72,425	105,537	72,425	$ 87,964
Property and equipment acquired	228	192	559	409
Gain on sale of assets	0	0	(395)	0
Specialty Health Care [Member]
Revenues	35,528	43,457	74,658	95,641
Cost of services	25,727	30,575	53,185	67,758
Gross profit	9,801	12,882	21,473	27,883
Selling, general and administrative	6,043	7,179	13,241	15,149
Depreciation and amortization of property and equipment	92	97	199	217
Amortization of acquired intangible assets	0		0
Operating income	3,666	5,606	8,033	12,517
Total assets	39,961	29,889	39,961	29,889
Property and equipment acquired	29	21	47	48
Gain on sale of assets			0
Engineering [Member]
Revenues	21,014	20,906	39,504	40,804
Cost of services	16,192	15,395	30,365	30,059
Gross profit	4,822	5,511	8,869	10,745
Selling, general and administrative	4,380	4,107	8,298	8,219
Depreciation and amortization of property and equipment	116	103	244	199
Amortization of acquired intangible assets	0		0
Operating income	326	1,300	722	2,327
Total assets	42,668	29,523	42,668	29,523
Property and equipment acquired	190	124	478	289
Gain on sale of assets			(395)
Life Sciences and IT [Member]
Revenues	10,493	9,983	19,997	19,862
Cost of services	6,356	6,693	12,555	13,387
Gross profit	4,137	3,290	7,442	6,475
Selling, general and administrative	2,300	1,978	4,580	4,043
Depreciation and amortization of property and equipment	34	25	70	47
Amortization of acquired intangible assets	46		91
Operating income	1,757	1,288	2,701	2,385
Total assets	17,947	7,962	17,947	7,962
Property and equipment acquired	2	43	19	63
Gain on sale of assets			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
Operating income	0	0	0	0
Total assets	4,961	5,051	4,961	5,051
Property and equipment acquired	$ 7	$ 4	15	$ 9
Gain on sale of assets			$ 0