Note 2 - Acquisition - Estimated Fair Value and Annual Amortization (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2021	Dec. 31, 2021
Finite-Lived Intangible Asset, Expected Amortization, Year One		$ 1,286
Finite-Lived Intangible Asset, Expected Amortization, Year Two		938
Finite-Lived Intangible Asset, Expected Amortization, Year Three		927
Finite-Lived Intangible Asset, Expected Amortization, Year Four		927
Finite-Lived Intangible Asset, Expected Amortization, Year Five		783
UEHC [Member]
Finite-Lived Intangible Asset, Expected Amortization, Year One	$ 724
Finite-Lived Intangible Asset, Expected Amortization, Year Two	364
Finite-Lived Intangible Asset, Expected Amortization, Year Three	364
Finite-Lived Intangible Asset, Expected Amortization, Year Four	364
Finite-Lived Intangible Asset, Expected Amortization, Year Five	364
Total, estimated fair value	8,830	$ 8,830
Customer Relationships [Member] | UEHC [Member]
Finite-lived, estimated fair value	$ 4,070
Amortization period (Year)	15 years
Finite-Lived Intangible Asset, Expected Amortization, Year One	$ 271
Finite-Lived Intangible Asset, Expected Amortization, Year Two	271
Finite-Lived Intangible Asset, Expected Amortization, Year Three	271
Finite-Lived Intangible Asset, Expected Amortization, Year Four	271
Finite-Lived Intangible Asset, Expected Amortization, Year Five	271
Trade Names [Member] | UEHC [Member]
Indefinite-lived, estimated fair value	3,150
Customer Contracts [Member] | UEHC [Member]
Finite-lived, estimated fair value	$ 1,130
Amortization period (Year)	15 years
Finite-Lived Intangible Asset, Expected Amortization, Year One	$ 75
Finite-Lived Intangible Asset, Expected Amortization, Year Two	75
Finite-Lived Intangible Asset, Expected Amortization, Year Three	75
Finite-Lived Intangible Asset, Expected Amortization, Year Four	75
Finite-Lived Intangible Asset, Expected Amortization, Year Five	75
Backlog [Member] | UEHC [Member]
Finite-lived, estimated fair value	$ 360
Amortization period (Year)	1 year
Finite-Lived Intangible Asset, Expected Amortization, Year One	$ 360
Finite-Lived Intangible Asset, Expected Amortization, Year Two	0
Finite-Lived Intangible Asset, Expected Amortization, Year Three	0
Finite-Lived Intangible Asset, Expected Amortization, Year Four	0
Finite-Lived Intangible Asset, Expected Amortization, Year Five	0
Technology-Based Intangible Assets [Member] | UEHC [Member]
Finite-lived, estimated fair value	$ 120
Amortization period (Year)	7 years
Finite-Lived Intangible Asset, Expected Amortization, Year One	$ 17
Finite-Lived Intangible Asset, Expected Amortization, Year Two	17
Finite-Lived Intangible Asset, Expected Amortization, Year Three	17
Finite-Lived Intangible Asset, Expected Amortization, Year Four	17
Finite-Lived Intangible Asset, Expected Amortization, Year Five	$ 17