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Note 3 - Accrued Expenses (Tables)
 9 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Accrued Liabilities [Table Text Block]
   
September 30,
    
December 31,
    
October 1,
  
   
2017
    
2016
    
2016
  
Accrued wages, bonuses and related expenses
   $
7,465
     $
5,596
     $
5,216
  
Sales tax payable
    
2,105
      
5,075
      
2,027
  
Accrued rent and related expenses
    
3,450
      
4,615
      
3,919
  
Current income taxes payable
    
35
      
611
      
756
  
Total
   $
13,055
     $
15,897
     $
11,918