Quarterly report pursuant to Section 13 or 15(d)

Note 3 - Fair Value Measurements (Tables)

v3.10.0.1
Note 3 - Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
    Level 1   Level 2   Level 3   Total
Liabilities
               
Liability classified stock purchase warrants   $
-
    $
-
    $
3,852,882
    $
3,852,882
 
Balance at December 31, 2017   $
-
    $
-
    $
3,852,882
    $
3,852,882
 
                                 
Liability classified stock purchase warrants   $
-
    $
-
    $
2,047,563
    $
2,047,563
 
Balance at September 30, 2018   $
-
    $
-
    $
2,047,563
    $
2,047,563
 
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
    Mark-to-market
liabilities - stock
purchase warrants
Balance at December 31, 2017   $
3,852,882
 
Change in fair value - gain    
(1,805,319
)
Balance at September 30, 2018   $
2,047,563
 
    Mark-to-market
liabilities - stock
purchase warrants
Balance at December 31, 2016   $
3,921,917
 
Issuance of warrants    
2,483,848
 
Exercise of warrants    
(4,023,057
)
Change in fair value - loss    
403,155
 
Balance at September 30, 2017   $
2,785,863