Quarterly report pursuant to Section 13 or 15(d)

Note 3 - Fair Value Measurements (Tables)

v3.19.1
Note 3 - Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 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   $
-
    $
-
    $
923,849
    $
923,849
 
Balance at March 31, 2019   $
-
    $
-
    $
923,849
    $
923,849
 
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    
340,115
 
Balance at March 31, 2019   $
923,849
 
      Mark-to-market
liabilities - stock
purchase warrants
 
Balance at December 31, 2017   $
3,852,882
 
Change in fair value - gain    
(190,219
)
Balance at March 31, 2018   $
3,662,663