Note 7 - Goodwill - Changes in Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 28, 2019	Dec. 29, 2018
Balance	$ 17,532	$ 11,685
Balance	16,354	17,532
TKE [Member]
Goodwill recorded, TKE acquisition		5,847
Adjustment to final TKE purchase price	(1,178)
Engineering [Member]
Balance	13,096	7,249
Balance	11,918	13,096
Engineering [Member] \| TKE [Member]
Goodwill recorded, TKE acquisition		5,847
Adjustment to final TKE purchase price	(1,178)
Specialty Health Care [Member]
Balance	2,398	2,398
Balance	2,398	2,398
Information Technology [Member]
Balance	2,038	2,038
Balance	$ 2,038	$ 2,038

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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