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Note 2 - Prepaid Expenses and Other Current Assets (Tables)
9 Months Ended
Sep. 30, 2017
Notes Tables  
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block]
   
September 30,
   
December 31,
   
October 1,
 
   
2017
   
2016
   
2016
 
Prepaid rent
  $
7,162
    $
7,191
    $
6,986
 
Other
   
6,203
     
5,546
     
6,766
 
Total
  $
13,365
    $
12,737
    $
13,752