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Note 6 - Acquisitions - Preliminary Estimated Purchase Price Allocation (Details) - USD ($)
$ in Thousands
Dec. 29, 2018
Sep. 30, 2018
Dec. 30, 2017
Dec. 31, 2016
Goodwill(a) $ 17,532   $ 11,685 $ 12,325
TKE [Member]        
Fixed assets   $ 12    
Goodwill(a) [1]   5,847    
Less: net liabilities assumed   (750)    
Total consideration   5,879    
TKE [Member] | Restricted Covenants [Member]        
Intangible assets, net   50    
TKE [Member] | Customer Relationships [Member]        
Intangible assets, net   $ 720    
[1] The goodwill is expected to be fully deductible for tax purposes, except the contingent consideration which is deductible only when paid.