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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 9 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Sep. 30, 2017
Oct. 01, 2016
Dec. 31, 2016
Net sales to external customers $ 82,428 $ 83,748 $ 250,285 $ 253,862  
Property and equipment, net 76,718 71,984 76,718 71,984 $ 74,924
North America [Member]          
Net sales to external customers [1] 67,036 68,227 207,863 209,105  
Property and equipment, net [1] 67,073 62,377 67,073 62,377  
Europe [Member]          
Net sales to external customers [2] 14,812 14,955 40,905 43,592  
Property and equipment, net [2] 9,612 8,385 9,612 8,385  
Other Geographic Region [Member]          
Net sales to external customers [3] 580 566 1,517 1,165  
Property and equipment, net [3] $ 33 $ 1,222 $ 33 $ 1,222  
[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