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Note 8 - Intangible Assets (Details) - Components of Intangible Assets (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 27, 2014
Dec. 28, 2013
Finite-Lived Intangible Assets [Line Items]    
Finite Lived Intangible asset $ 219 $ 216
Amortization of intangibles during the thirty-nine week period ended September 27, 2014 65  
Engineering [Member] | PCI [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Intangibles acquired, PCI acquisition 68  
Engineering [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Finite Lived Intangible asset 206 179
Amortization of intangibles during the thirty-nine week period ended September 27, 2014 41  
Information Technology [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Finite Lived Intangible asset 13 37
Amortization of intangibles during the thirty-nine week period ended September 27, 2014 24  
PCI [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Intangibles acquired, PCI acquisition $ 68