Note 20 - Subsequent Events (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 03, 2021	Jun. 27, 2020	Jul. 03, 2021	Jun. 27, 2020
Revenue from Contract with Customer, Including Assessed Tax	$ 48,933	$ 32,652	$ 93,482	$ 77,685
Engineering [Member]
Revenue from Contract with Customer, Including Assessed Tax	16,934	14,038	31,400	28,201
Engineering [Member] | Pickering and Kincardine Offices [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 2,100	$ 2,900	$ 4,400	$ 5,900