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Derivative Financial Instruments (Details 4) (Compound Embedded Derivatives [Member], USD $)
6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 01, 2012
Jun. 01, 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 (676,718)      
Changes in fair value inputs and assumptions reflected in income 1,227,451 1,122,065    
Balance at June 30 $ 5,198,882 $ 4,520,691 $ 2,680,133 $ 4,075,344