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Note 15 - Segment Information - Sales to External Customers and Long-lived Assets by Geographic Area (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Jan. 02, 2016
Revenues $ 357,866 $ 364,204 $ 377,694
Property and equipment, net 77,751 74,924 67,741
North America [Member]      
Revenues [1] 293,282 296,152 297,554
Property and equipment, net [1] 68,141 66,154 61,211
Europe [Member]      
Revenues [2] 61,901 66,140 78,788
Property and equipment, net [2] 9,578 8,733 6,459
Other Geographic Region [Member]      
Revenues [3] 2,683 1,912 1,352
Property and equipment, net [3] $ 32 $ 37 $ 71
[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 corporately-managed location in China