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Note 3 - Patents
12 Months Ended
Dec. 31, 2012
Goodwill and Intangible Assets Disclosure [Text Block]
3. Patents

Patents are stated at cost less accumulated amortization and consist of the following at December 31, 2012 and 2011:

   
2012
   
2011
 
Patents
  $ 158,429     $ 154,355  
Less: accumulated amortization
    (64,329 )     (48,799 )
Patents, net
  $ 94,100     $ 105,556  

Amortization expense amounted to $15,530 and $15,290 for the years ended December 31, 2012 and 2011, respectively.

Estimated future amortization expense is as follows:

2013
  $ 15,592  
2014
    15,592  
2015
    14,627  
2016
    11,733  
2017
    11,733  
thereafter
    24,823  
Total expense
  $ 94,100