Quarterly report pursuant to Section 13 or 15(d)

Note 3 - Fair Value Measurements (Tables)

v3.19.2
Note 3 - Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2019
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   $
-
    $
-
    $
583,734
    $
583,734
 
Balance at December 31, 2018   $
-
    $
-
    $
583,734
    $
583,734
 
                                 
Liability classified stock purchase warrants   $
-
    $
-
    $
487,723
    $
487,723
 
Balance at June 30, 2019   $
-
    $
-
    $
487,723
    $
487,723
 
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
    Mark-to-market liabilities - stock purchase warrants
Balance at December 31, 2018   $
583,734
 
Change in fair value - loss    
(96,011
)
Balance at June 30, 2019   $
487,723
 
    Mark-to-market liabilities - stock purchase warrants
Balance at December 31, 2017   $
3,852,882
 
Change in fair value - gain    
(1,569,049
)
Balance at June 30, 2018   $
2,283,833