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Note 9 - Stockholders' Equity (Details Textual) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2018
Mar. 31, 2018
Feb. 28, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Sep. 05, 2018
Dec. 31, 2017
Conversion of Stock, Shares Converted           1,000 178    
Conversion of Stock, Shares Issued           66,666,666 11,862,000    
Preferred Stock, Par or Stated Value Per Share $ 0.01     $ 0.01   $ 0.01     $ 0.01
Class of Warrant or Right, Number of Securities Called by Warrants or Rights     178,571            
Warrants and Rights Outstanding, Term     5 years            
Stock Issued During Period, Shares, Issued for Services     5,000,000            
Common Stock, Par or Stated Value Per Share $ 0.001   $ 0.042 $ 0.001   $ 0.001     $ 0.001
Class of Warrant or Right, Outstanding 0     0   0      
Employee Stock Option [Member]                  
Allocated Share-based Compensation Expense, Total       $ 85,370 $ 14,433 $ 132,569 $ 43,535    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total $ 145,230     145,230   $ 145,230      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition           1 year 328 days      
Common Stock Issued For Services [Member]                  
Allocated Share-based Compensation Expense, Total       57,143   $ 142,856      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total $ 57,143     $ 57,143   $ 57,143      
Series G Warrants [Member]                  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights               47,169,812  
Class of Warrant or Right, Exercise Price of Warrants or Rights               $ 0.02544  
Warrants and Rights Outstanding, Term               3 years  
Series B Convertible Preferred Stock [Member]                  
Preferred Stock, Shares Outstanding, Ending Balance 100     100   100     100
Convertible Preferred Stock, Conversion Price1 $ 0.35     $ 0.35   $ 0.35      
Convertible Preferred Stock, Total Conversion Shares 285,714     285,714   285,714      
Conversion of Stock, Shares Converted           0      
Preferred Stock, Par or Stated Value Per Share $ 1,000     $ 1,000   $ 1,000     $ 1,000
Series C Convertible Preferred Stock [Member]                  
Preferred Stock, Shares Outstanding, Ending Balance 2,570     2,570   2,570     2,570
Convertible Preferred Stock, Conversion Price1 $ 0.015     $ 0.015   $ 0.015      
Convertible Preferred Stock, Total Conversion Shares 171,349,733     171,349,733   171,349,733      
Conversion of Stock, Shares Converted           0      
Preferred Stock, Par or Stated Value Per Share $ 1,000     $ 1,000   $ 1,000     $ 1,000
Series D Convertible Preferred Stock [Member]                  
Preferred Stock, Shares Outstanding, Ending Balance 0     0   0     1,000
Conversion of Stock, Shares Converted           1,000      
Conversion of Stock, Shares Issued           66,666,666      
Preferred Stock, Par or Stated Value Per Share $ 1,000     $ 1,000   $ 1,000     $ 1,000
Series E Convertible Preferred Stock [Member]                  
Preferred Stock, Shares Outstanding, Ending Balance 1,200     1,200   1,200     0
Convertible Preferred Stock, Conversion Price1 $ 0.02544     $ 0.02544   $ 0.02544      
Conversion of Stock, Shares Converted   600       0      
Preferred Stock, Par or Stated Value Per Share $ 1,000 $ 1,000   $ 1,000   $ 1,000     $ 1,000
Proceeds From Issuance Of Convertible Preferred Stock, Net of Issuance Cost $ 600,000 $ 590,000              
Stock Issued During Period, Shares, New Issues 600