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Note 8 - Derivative Liabilities (Tables)
 6 Months Ended
Jun. 30, 2019
Notes Tables  
Schedule of Derivative Liabilities at Fair Value [Table Text Block]
Derivative liabilities as of December 31, 2018
   $
4,359
  
Reclassification of derivative liabilities
    
(628
)
Loss on change in fair value of derivative liabilities
    
2,315
  
         
Derivative liabilities as of June 30, 2019
   $
6,046