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Note 8 - Stockholders' Equity (Details Textual) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended
May 31, 2017
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Aug. 04, 2017
Aug. 03, 2017
May 01, 2017
Apr. 30, 2017
Dec. 31, 2016
Preferred Stock, Par or Stated Value Per Share   $ 0.01   $ 0.01           $ 0.01
Proceeds from Issuance of Convertible Preferred Stock       $ 980,000          
Common Stock, Shares Authorized   600,000,000   600,000,000   600,000,000 300,000,000     300,000,000
Stock Issued During Period, Shares, Warrants Exercised       3,816,667            
Proceeds from Warrant Exercises       $ 154,167            
Employee Stock Option [Member]                    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized   $ 88,449   $ 88,449            
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition       1 year 328 days            
Warrant [Member]                    
Allocated Share-based Compensation Expense     $ 15,030   484,829          
2006 Equity Incentive Plan [Member]                    
Allocated Share-based Compensation Expense   $ 14,433 $ 13,686 $ 43,535 $ 41,058          
Conversion of Series C Preferred Stock Into Common Stock [Member]                    
Conversion of Stock, Shares Converted       178            
Stock Issued During Period, Shares, New Issues       11,862,000            
Series B Convertible Preferred Stock [Member]                    
Preferred Stock, Shares Outstanding   100   100           100
Convertible Preferred Stock, Conversion Price1   $ 0.35   $ 0.35            
Convertible Preferred Stock, Total Conversion Shares   285,714   285,714            
Conversion of Stock, Shares Converted       0            
Preferred Stock, Par or Stated Value Per Share   $ 1,000   $ 1,000           $ 1,000
Series C Convertible Preferred Stock [Member]                    
Preferred Stock, Shares Outstanding   2,690   2,690           2,868
Convertible Preferred Stock, Conversion Price1   $ 0.015   $ 0.015       $ 0.015 $ 0.05  
Convertible Preferred Stock, Total Conversion Shares   179,349,733   179,349,733            
Conversion of Stock, Shares Converted       178 132          
Preferred Stock, Par or Stated Value Per Share   $ 1,000   $ 1,000           $ 1,000
Series D Convertible Preferred Stock [Member]                    
Preferred Stock, Shares Outstanding   1,000   1,000           0
Convertible Preferred Stock, Conversion Price1 $ 0.015                  
Stock Issued During Period, Shares, New Issues 1,000                  
Preferred Stock, Par or Stated Value Per Share $ 1,000 $ 1,000   $ 1,000           $ 1,000
Proceeds from Issuance of Convertible Preferred Stock, Gross $ 1,000,000                  
Proceeds from Issuance of Convertible Preferred Stock $ 980,000