Note 6 - Acquisitions and Divestitures (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Jan. 01, 2022	Jan. 02, 2021	Dec. 30, 2023	Jul. 03, 2021
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability	$ 0	$ 52	$ 145
Payment for Contingent Consideration Liability, Financing Activities	99	494	345
Revenue from Contract with Customer, Including Assessed Tax	284,680	203,875	150,409
Engineering [Member]
Revenue from Contract with Customer, Including Assessed Tax	85,937	66,172	57,715
Engineering [Member] | Pickering and Kincardine Offices [Member]
Revenue from Contract with Customer, Including Assessed Tax		4,900	11,800
Escrow Deposit	400				$ 700
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	400
Payment for Contingent Consideration Liability, Financing Activities	300
TKE [Member] | Forecast [Member]
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High				$ 300
PSR & TKE Acquisitions [Member]
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	11,800
Payment for Contingent Consideration Liability, Financing Activities	$ 100	$ 500	$ 300