Note 7 - Goodwill - Changes in Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 02, 2021	Dec. 28, 2019
Balance	$ 16,354	$ 17,532
Adjustment to final TKE purchase price
Balance	16,354	16,354
TKE [Member]
Adjustment to final TKE purchase price		(1,178)
Engineering [Member]
Balance	11,918	13,096
Adjustment to final TKE purchase price
Balance	11,918	11,918
Engineering [Member] | TKE [Member]
Adjustment to final TKE purchase price		(1,178)
Specialty Health Care [Member]
Balance	2,398	2,398
Adjustment to final TKE purchase price
Balance	2,398	2,398
Specialty Health Care [Member] | TKE [Member]
Adjustment to final TKE purchase price
Information Technology [Member]
Balance	2,038	2,038
Adjustment to final TKE purchase price
Balance	$ 2,038	2,038
Information Technology [Member] | TKE [Member]
Adjustment to final TKE purchase price