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Note 6 - Note Payable (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Debt [Table Text Block]
Year Ending December 31,
 
 
 
 
2017
   $
2,719
  
2018
    
4,463
  
2019
    
4,512
  
Total payments
    
11,694
  
Less: Amount representing interest
    
(1,694
 )
Present value of obligations
    
10,000
  
Less: Unamortized debt discount
    
(371
 )
     
9,629
  
Less: Note payable, noncurrent portion
    
7,762
  
Note payable, current portion
   $
1,867