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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
Apr. 01, 2017
Apr. 02, 2016
Dec. 31, 2016
Net sales to external customers $ 90,632 $ 94,976  
Property and equipment, net 73,246 68,886 $ 74,924
North America [Member]      
Net sales to external customers [1] 76,725 79,507  
Property and equipment, net [1] 64,554 61,164  
Europe [Member]      
Net sales to external customers [2] 13,440 15,208  
Property and equipment, net [2] 8,656 7,313  
Other Geographic Region [Member]      
Net sales to external customers [3] 467 261  
Property and equipment, net [3] $ 36 $ 409  
[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