Note 6 - Acquisitions (Details Textual) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
	Jul. 30, 2021	Jan. 01, 2022	Jan. 01, 2022	Jan. 02, 2021
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability			$ 52	$ 145
Payment for Contingent Consideration Liability, Financing Activities			494	345
Revenue from Contract with Customer, Including Assessed Tax			203,875	150,409
Gain (Loss) on Disposition of Business			2,420	(0)
Engineering [Member]
Revenue from Contract with Customer, Including Assessed Tax			66,172	57,715
Gain (Loss) on Disposition of Business			2,420
Engineering [Member] | Pickering and Kincardine Offices [Member]
Revenue from Contract with Customer, Including Assessed Tax			4,900	11,800
Gain (Loss) on Disposition of Business	$ 2,400
Escrow Deposit	$ 800
Sale of Assets, Escrow Deposit, Expected Period for Return of Deposit (Month)	18 months
PSR & TKE Acquisitions [Member]
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High		$ 700	700
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability		$ (1,700)
Payment for Contingent Consideration Liability, Financing Activities			$ 500	$ 300