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Investments in Available-for-Sale Securities (Details) (USD $)
Jun. 30, 2012
Dec. 31, 2011
Available-for-sale Securities, Cost $ 2,640,220 $ 2,516,799
Available-for-sale Securities, Unrealized Gains 27,077 12,787
Available-for-sale Securities, Unrealized Losses (39,786) (37,813)
Available-for-sale Securities, Fair Value 2,627,511 2,491,773
U.S. federal agency securities [Member]
   
Available-for-sale Securities, Cost 19,615 15,153
Available-for-sale Securities, Unrealized Gains 341 411
Available-for-sale Securities, Unrealized Losses 0 0
Available-for-sale Securities, Fair Value 19,956 15,564
Municipal securities [Member]
   
Available-for-sale Securities, Cost 231,400  
Available-for-sale Securities, Unrealized Gains 0  
Available-for-sale Securities, Unrealized Losses (36)  
Available-for-sale Securities, Fair Value 231,364  
Certificates Of Deposit [Member]
   
Available-for-sale Securities, Cost 1,757,013 1,725,402
Available-for-sale Securities, Unrealized Gains 7,667 11,154
Available-for-sale Securities, Unrealized Losses (10,188) (13,970)
Available-for-sale Securities, Fair Value 1,754,492 1,722,586
Corporate Debt Securities [Member]
   
Available-for-sale Securities, Cost 624,287 776,244
Available-for-sale Securities, Unrealized Gains 2,613 1,222
Available-for-sale Securities, Unrealized Losses (29,562) (23,843)
Available-for-sale Securities, Fair Value 597,338 753,623
Equity Securities [Member]
   
Available-for-sale Securities, Cost 7,905  
Available-for-sale Securities, Unrealized Gains 16,456  
Available-for-sale Securities, Unrealized Losses 0  
Available-for-sale Securities, Fair Value $ 24,361