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Derivative Financial Instruments (Details 3) (Compound embedded derivative [Member], USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Compound embedded derivative [Member]
   
Changes in fair value inputs and assumptions    
Balances at January 1 $ 1,529,583 $ 2,680,133
Issuances      
Expirations from redemptions of host contracts reflected in income (437,889)  
Changes in fair value inputs and assumptions reflected in income 640,563 (472,970)
Balances at March 31 $ 1,732,257 $ 2,207,163