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Derivative Financial Instruments (Details 4) (Compound Embedded Derivatives [Member], USD $)
9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Compound Embedded Derivatives [Member]
   
Changes in fair value inputs and assumptions    
Balance at January 1 $ 2,680,133 $ 4,075,344
Issuances 1,291,298  
Expirations from redemptions of host contracts reflected in income (650,627) (676,718)
Changes in fair value inputs and assumptions reflected in income (682,289) (63,490)
Balances at September 30 $ 2,638,515 $ 3,335,136