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Other Income
 12 Months Ended
Dec. 31, 2012
Other Income  
Other Income

(11) Other Income

        Other income, net for 2012, 2011 and 2010 was as follows:

 
   Years Ended December 31,  
 
   2012   2011   2010  

Interest income

   $ 83,416   $ 117,680   $ 84,199  

Interest expense

     (308,389 )   —     —  

Foreign currency exchange gain (loss)

     242,564     (37,276 )   542,108  

Other

     2,921     (805 )   2,605  
               

Total other income

   $ 20,512   $ 79,599   $ 628,912