Note 6 - Acquisitions and Divestitures (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2023	Dec. 31, 2022	Jan. 01, 2022
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability	$ 0	$ 0	$ 52
Payment for Contingent Consideration Liability, Financing Activities	339	99	494
Gain (Loss) on Disposition of Business	395	219	2,420
Revenue from Contract with Customer, Including Assessed Tax	263,237	284,680	203,875
Engineering [Member]
Gain (Loss) on Disposition of Business	395	219	2,420
Revenue from Contract with Customer, Including Assessed Tax	84,675	85,937	66,172
Engineering [Member] | Pickering and Kincardine Offices [Member]
Gain (Loss) on Disposition of Business			2,400
Gain (Loss) on Disposition of Assets	400	200
Revenue from Contract with Customer, Including Assessed Tax			4,900
TKE [Member]
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability		100	1,700
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	300	400
Payment for Contingent Consideration Liability, Financing Activities		300
PSR & TKE Acquisitions [Member]
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	9,600
Payment for Contingent Consideration Liability, Financing Activities	$ 300	$ 100	$ 500