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Note 8 - Sales to External Customers and Long-lived Assets by Geographic Area (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 02, 2016
Jul. 04, 2015
Jul. 02, 2016
Jul. 04, 2015
Jan. 02, 2016
North America [Member]          
Net sales to external customers [1] $ 61,371 $ 64,472 $ 140,878 $ 141,119  
Property and equipment, net [1] 61,263 52,604 61,263 52,604  
Europe [Member]          
Net sales to external customers [2] 13,430 16,213 28,638 32,628  
Property and equipment, net [2] 7,548 5,835 7,548 5,835  
Other Geographic Region [Member]          
Net sales to external customers [3] 338 329 599 659  
Property and equipment, net [3] 1,061 1,061  
Net sales to external customers 75,139 81,014 170,115 174,406  
Property and equipment, net $ 69,872 $ 58,439 $ 69,872 $ 58,439 $ 67,741
[1] North America includes the United States, Canada, Puerto Rico and franchise business in Mexico
[2] Europe includes the United Kingdom, Ireland, Denmark (in 2015) and franchise businesses in Europe
[3] Other includes franchise businesses outside of North America and Europe