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Note 6 - Warrants (Tables)
9 Months Ended
Sep. 30, 2016
Notes Tables  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
Balance, September 30, 2015
 
Warrants
 
 
 
 
 
 
 
 
outstanding
 
 
Price Range
 
Outstanding as of December 31, 2014
    8,838,122     $0.125  1.00  
Issued
    9,387,214     0.30 0.75  
Expired
    (4,582,079 )   0.25 0.75  
Outstanding as of September 30, 2015
    13,643,257     $0.125 1.00  
Balance, September 30, 2016
 
Warrants
 
 
 
 
 
 
 
 
outstanding
 
 
Price Range
 
Outstanding as of December 31, 2015
    13,779,438     $0.125 1.00  
Issued
    5,670,996     0.35 0.70  
Exercised
    (1,150,000 )   0.30 0.40  
Expired
    (263,545 )   0.55 0.75  
Outstanding as of September 30, 2016
    18,036,889     $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 1.60%
 
  0.95  1.36%
 
Expected volatility
  255 332%
 
  311 315%
 
Expected dividend yield
               
Forfeiture rate
               
Expected life in years
  3 5       5