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Note 8 - Stockholders' Equity (Details Textual) - USD ($)
 1 Months Ended 2 Months Ended 3 Months Ended 6 Months Ended
May 31, 2017
Apr. 30, 2017
Mar. 31, 2017
Jun. 30, 2017
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
May 01, 2017
Dec. 31, 2016
Preferred Stock, Par or Stated Value Per Share       $ 0.01 $ 0.01   $ 0.01     $ 0.01
Proceeds from Issuance of Convertible Preferred Stock             $ 980,000    
Stock Issued During Period, Shares, Warrants Exercised 333,333 2,500,000 983,334              
Proceeds from Warrant Exercises $ 5,000 $ 100,000 $ 49,167              
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized       $ 102,882 $ 102,882   $ 102,882      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition             2 years 36 days      
2006 Equity Incentive Plan [Member]                    
Allocated Share-based Compensation Expense         $ 14,522 $ 13,686 $ 29,102 $ 27,372    
Conversion of Series C Preferred Stock Into Common Stock [Member]                    
Stock Issued During Period, Shares, New Issues       3,862,000     3,862,000      
Conversion of Stock, Shares Converted       58     58      
Series B Convertible Preferred Stock [Member]                    
Convertible Preferred Stock, Total Conversion Shares       285,714 285,714   285,714      
Conversion of Stock, Shares Converted             0      
Preferred Stock, Shares Outstanding       100 100   100     100
Preferred Stock, Par or Stated Value Per Share       $ 1,000 $ 1,000   $ 1,000     $ 1,000
Convertible Preferred Stock, Conversion Price1       $ 0.35 $ 0.35   $ 0.35      
Series C Convertible Preferred Stock [Member]                    
Convertible Preferred Stock, Total Conversion Shares       187,349,733 187,349,733   187,349,733      
Conversion of Stock, Shares Converted             58 132    
Preferred Stock, Shares Outstanding       2,810 2,810   2,810     2,868
Preferred Stock, Par or Stated Value Per Share       $ 1,000 $ 1,000   $ 1,000     $ 1,000
Convertible Preferred Stock, Conversion Price1   $ 0.05   $ 0.015 $ 0.015   $ 0.015   $ 0.015  
Series D Convertible Preferred Stock [Member]                    
Stock Issued During Period, Shares, New Issues 1,000                  
Preferred Stock, Shares Outstanding       1,000 1,000   1,000     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, Gross $ 1,000,000                  
Proceeds from Issuance of Convertible Preferred Stock $ 980,000                  
Convertible Preferred Stock, Conversion Price1 $ 0.015