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Note 7 - Property and Equipment (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Property, Plant and Equipment [Table Text Block]
    December 31,
    2017   2016
Equipment and software   $
37,137
     $
27,456
  
Furniture and fixtures    
1,947
      
1,126
  
Leasehold improvements    
31,459
      
27,796
  
Construction in progress    
5,830
      
22,695
  
Subtotal    
76,373
      
79,073
  
Less accumulated depreciation    
(20,190
 )    
(26,777
 )
Total   $
56,183
     $
52,296