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Note 3 - Property and Equipment (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
December 31,
  
   
2019
    
2018
  
Computer equipment
   $
10,880
     $
10,536
  
Software
    
4,690
      
4,112
  
Furniture, fixtures, and equipment
    
2,395
      
2,299
  
Leasehold improvements
    
6,095
      
5,474
  
Laboratory and other equipment
    
4,933
      
2,389
  
Test equipment
    
22,980
      
14,697
  
Construction-in-progress
    
18,245
      
20,293
  
     
70,218
      
59,800
  
Less: accumulated depreciation and amortization
    
(29,420
 )    
(24,119
 )
Total
   $
40,798
     $
35,681