Quarterly report pursuant to Section 13 or 15(d)

Note 3 - Fair Value Measurements (Tables)

v3.7.0.1
Note 3 - Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
    Level 1   Level 2   Level 3   Total
Liabilities                                
Derivative instruments - stock purchase warrants   $
-
    $
-
    $
3,921,917
    $
3,921,917
 
Balance at December 31, 2016   $
-
    $
-
    $
3,921,917
    $
3,921,917
 
                                 
Derivative instruments - stock purchase warrants   $
-
    $
-
    $
3,267,408
    $
3,267,408
 
Balance at June 30, 2017   $
-
    $
-
    $
3,267,408
    $
3,267,408
 
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
    Derivative
instruments - stock
purchase warrants
Balance at December 31, 2016   $
3,921,917
 
Exercise of warrants    
(3,737,434
)
Change in fair value - loss    
3,082,925
 
Balance at June 30, 2017   $
3,267,408
 
    Derivative
instruments - stock
purchase warrants
Balance at December 31, 2015   $
-
 
Issuance of warrants    
4,582,170
 
Change in fair value - gain    
(757,275
)
Balance at June 30, 2016   $
3,824,895