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Note 6 - Warrants (Tables)
3 Months Ended
Mar. 31, 2017
Notes Tables  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
As of March 31, 2016
 
Number of
 
 
 
 
 
 
 
 
Shares
 
 
Price Range
 
Balance, December 31, 2015
   
13,779,438
   
$0.125
1.00
 
Issued
   
728,571
   
 
0.45
 
 
Expired
   
   
 
 
 
Balance, March 31, 2016
   
14,508,009
   
$0.125
1.00
 
As of March 31, 2017
 
Number of
 
 
 
 
 
 
 
 
Shares
 
 
Price Range
 
Balance, December 31, 2016
   
20,035,114
   
$0.125
1.00
 
Issued
   
219,298
   
 
0.70
 
 
Exercised
   
(510,000
)  
0.25
0.30
 
Balance, March 31, 2017
   
19,744,412
   
$0.125
1.00
 
Schedule Of Assumptions Used To Determine Fair Value Of Warrants [Table Text Block]
 
 
2016
 
 
2017
 
Risk free interest rate
   
1.36
%
   
1.93
%
Expected volatility
   
315
%
   
297
%
Expected dividend yield
   
     
 
Forfeiture rate
   
     
 
Expected life in years
   
5
     
5