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Note 9 - Segment Information - Sales to External Customers and Long-lived Assets by Geographic Area (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 01, 2017
Jul. 02, 2016
Jul. 01, 2017
Jul. 02, 2016
Dec. 31, 2016
Net sales to external customers $ 77,226 $ 75,139 $ 167,857 $ 170,115  
Property and equipment, net 75,667 69,872 75,667 69,872 $ 74,924
North America [Member]          
Net sales to external customers [1] 64,102 61,371 140,826 140,878  
Property and equipment, net [1] 66,088 61,263 66,088 61,263  
Europe [Member]          
Net sales to external customers [2] 12,654 13,430 26,094 28,638  
Property and equipment, net [2] 9,545 7,548 9,545 7,548  
Other Geographic Region [Member]          
Net sales to external customers [3] 470 338 937 599  
Property and equipment, net [3] $ 34 $ 1,061 $ 34 $ 1,061  
[1] North America includes the United States, Canada, Puerto Rico and franchise business in Mexico
[2] Europe includes the United Kingdom, Ireland, Denmark and franchise businesses in Europe
[3] Other includes franchise businesses outside of North America and Europe and, beginning in 2016, a company-owned store in China