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Note 8 - Common Stock (Tables)
12 Months Ended
Dec. 31, 2015
Notes Tables  
Schedule of Conversions of Convertible Preferred Stock [Table Text Block]
   
2015
   
2014
   
2013
 
Conversion of Series A Preferred Stock
    -0-       202,857       2,048,570  
Conversion of Series B Preferred Stock
    -0-       4,428,571       -0-  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
 
Expiration Date
 
 
Number of Shares
   
Weighted Average
Exercise Price
 
February 27, 2016
    16,666,666     $ 0.09  
December 31, 2016
    1,806,159       1.00  
January 16, 2017
    45,000       1.00  
January 31, 2017
    567,001       1.00  
March 21, 2017
    2,690,666       0.09  
February 27, 2020
    34,666,665       0.11  
Outstanding at December 31, 2015
    56,442,157     $ 0.14  
Exercisable at December 31, 2015
    39,775,491     $ 0.16  
Schedule of Stock by Class [Table Text Block]
Stock Purchase Warrants
    56,442,157  
Stock Option Plan
    1,722,529  
Series B Convertible Preferred Stock
    285,714  
Series C Convertible Preferred Stock
    31,860,662  
Total
    90,311,062