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Available- for-Sale Securities (Details) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Amortized cost, gross unrealized gains, gross unrealized losses and approximate fair values of available-for-sale securities    
Amortized Cost $ 42,337,100 $ 66,253,296
Gross Unrealized Gains 26,170 1,113,520
Gross Unrealized Losses (643,590) (896,844)
Fair Value 41,719,320 66,469,972
U. S. Government agency bonds [Member]
   
Amortized cost, gross unrealized gains, gross unrealized losses and approximate fair values of available-for-sale securities    
Amortized Cost 7,500,000 5,000,000
Gross Unrealized Gains 26,170 37,085
Fair Value 7,526,170 5,037,085
U. S. Government agency mortgage-backed securities [Member]
   
Amortized cost, gross unrealized gains, gross unrealized losses and approximate fair values of available-for-sale securities    
Amortized Cost 25,837,100 49,004,232
Gross Unrealized Gains   1,051,097
Gross Unrealized Losses (130,209) (5,900)
Fair Value 25,706,891 50,049,429
Corporate bonds [Member]
   
Amortized cost, gross unrealized gains, gross unrealized losses and approximate fair values of available-for-sale securities    
Amortized Cost 9,000,000 12,249,064
Gross Unrealized Gains   25,338
Gross Unrealized Losses (513,741) (890,944)
Fair Value $ 8,486,259 $ 11,383,458