Annual report pursuant to Section 13 and 15(d)

Goodwill and Intangible Assets (Details)

Goodwill and Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 27, 2014
Dec. 28, 2013
Finite-Lived Intangible Assets [Line Items]    
Goodwill, Acquired During Period $ 0us-gaap_GoodwillAcquiredDuringPeriod $ 726us-gaap_GoodwillAcquiredDuringPeriod
Summary of changes in goodwill    
Goodwill, Beginning Balance 5,221us-gaap_Goodwill 4,472us-gaap_Goodwill
Currency translation (80)us-gaap_GoodwillTranslationAdjustments 23us-gaap_GoodwillTranslationAdjustments
Goodwill, Ending Balance $ 5,141us-gaap_Goodwill $ 5,221us-gaap_Goodwill