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Note 6 - Goodwill, Intangible Assets and Long Term Assets - (Narrative) (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 27, 2016
Mar. 29, 2015
Finite-Lived Intangible Assets [Line Items]    
Amortization expense $ 137 $ 60
Selling, general and administrative    
Finite-Lived Intangible Assets [Line Items]    
Amortization expense 86 28
Research and development    
Finite-Lived Intangible Assets [Line Items]    
Amortization expense $ 51 $ 32