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Note 3 - Patents, net
12 Months Ended
Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets Disclosure [Text Block]

3. Patents, net


Patents are stated at cost less accumulated amortization and consist of the following at December 31, 2013 and 2012:


   

2013

   

2012

 

Patents

  $ 173,488     $ 158,429  

Less: accumulated amortization

    (80,449 )     (64,329 )

Patents, net

  $ 93,039     $ 94,100  

Amortization expense amounted to $16,120 and $15,530 for the years ended December 31, 2013 and 2012, respectively.


Estimated future amortization expense is as follows:


2014

  $ 16,376  

2015

    16,376  

2016

    12,525  

2017

    12,525  

2018

    11,162  

thereafter

    24,075  

Total expense

  $ 93,039