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Note 4 - Intangible Assets (Tables)
12 Months Ended
Dec. 31, 2015
Notes Tables  
Schedule of Finite-Lived Intangible Assets [Table Text Block]
   
2015
   
2014
 
                 
Patents, at cost
  $ 3,502,135     $ 3,502,135  
Less accumulated amortization
    (3,195,379 )     (2,888,622 )
Net intangible assets
  $ 306,756     $ 613,513  
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]
Years ending December 31,
 
Amount
 
         
2016
    306,756  
Total
  $ 306,756  
Schedule of Amortization Period for Intangible Assets [Table Text Block]
   
Amount
   
Weighted
Average
Period
(Years)
 
Patents
  $ 3,502,135       11.4