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Note 6 - Warrants (Tables)
6 Months Ended
Jun. 30, 2016
Notes Tables  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
Balance, June 30, 2015
 
Number of
 
 
 
 
   
 
 
 
Shares
 
 
Price Range
 
Outstanding as of December 31, 2014
    8,838,122       $0.125 1.00  
Issued
    1,501,900       0.30 0.75  
Expired
               
Outstanding as of June 30, 2015
    10,340,022       $0.125 1.00  
Balance, June 30, 2016
 
Number of
 
 
 
 
   
 
 
 
Shares
 
 
Price Range
 
Outstanding as of December 31, 2015
    13,779,438       $0.125 1.00  
Issued
    1,828,571         0.45    
Expired
    (183,545 )       0.55    
Outstanding as of June 30, 2016
    15,424,464       $0.125 1.00  
Schedule Of Assumptions Used To Determine Fair Value Of Warrants [Table Text Block]
 
 
2015
 
 
2016
 
Risk free interest rate
    0.97 1.71%
 
    1.26 1.36%
 
Expected volatility
    329 332%
 
    311 315%
 
Expected dividend yield
                   
Forfeiture rate
                   
Expected life in years
      5           5