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Note 8 - Stockholders' Equity (Details Textual) - USD ($)
 2 Months Ended 3 Months Ended 6 Months Ended
Feb. 15, 2016
Jun. 30, 2016
Feb. 29, 2016
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Jun. 14, 2016
Jun. 13, 2016
Dec. 31, 2015
Series C Convertible Preferred Stock [Member]                    
Stock Issued During Period, Shares, New Issues     1,400,000              
Conversion of Stock, Shares Converted     132     132        
Preferred Stock, Shares Outstanding   2,868   2,868   2,868       3,000
Convertible Preferred Stock, Total Conversion Shares   30,460,662   30,460,662   30,460,662        
Common Stock, Capital Shares Reserved for Future Issuance   30,460,662   30,460,662   30,460,662        
Series B Convertible Preferred Stock [Member]                    
Preferred Stock, Shares Outstanding   100   100   100       100
Convertible Preferred Stock, Total Conversion Shares   285,714   285,714   285,714        
Common Stock, Capital Shares Reserved for Future Issuance   285,714   285,714   285,714        
Common Stock Warrants [Member]                    
Stock Issued During Period, Shares, New Issues           5,064,588        
Series E Warrants [Member]                    
Warrant Exercise Fee Per Share $ 0.02916                  
Class of Warrant or Right, Exercised During Period 3,664,588 1,400,000                
Proceeds from Warrant Exercises $ 238,198 $ 91,000                
General and Administrative Expense $ 469,799                  
2006 Equity Incentive Plan [Member]                    
Common Stock, Capital Shares Reserved for Future Issuance   1,722,529   1,722,529   1,722,529        
Equity Incentive Plan 2016 [Member]                    
Common Stock, Capital Shares Reserved for Future Issuance   3,000,000   3,000,000   3,000,000        
Employee Stock Option [Member]                    
Common Stock, Capital Shares Reserved for Future Issuance   4,722,529   4,722,529   4,722,529        
Allocated Share-based Compensation Expense       $ 13,686 $ 16,903 $ 27,372 $ 33,590      
Common Stock, Shares Authorized   300,000,000   300,000,000   300,000,000   300,000,000 150,000,000 150,000,000
Common Stock, Capital Shares Reserved for Future Issuance   86,846,474   86,846,474   86,846,474        
Class of Warrant or Right, Exercised During Period           (5,064,588)        
General and Administrative Expense       $ 344,818 $ 364,889 $ 1,251,323 $ 766,330      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized   $ 67,972   $ 67,972   $ 67,972        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition           1 year 292 days