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Note 6 - Note Payable (Tables)
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Notes Tables    
Schedule of Debt [Table Text Block]
Year Ending December 31,
 
 
 
 
2016 (remaining 9 months)
   $ 1,530  
2017
     2,124  
2018
     1,161  
2019
     34  
Total payments
     4,849  
Less: Amount representing interest
     (315
)
Present value of obligations
     4,534  
Less: Unamortized debt discount
     (342
)
      4,192  
Less: Notes payable, current portion
     4,192  
Note payable, noncurrent portion
   $ -  
Year Ending December 31,
 
 
 
 
2016
   $ 1,894  
2017
     2,124  
2018
     1,161  
2019
     34  
Total payments
     5,213  
Less: Amount representing interest
     (380
)
Present value of obligations
     4,833  
Less: Notes payable, current portion
     4,833  
Note payable, noncurrent portion
   $ -