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Available-for-Sale Securities - Amortized Cost and Fair Value of Available-for-Sale Debt Securities by Contractual Maturity (Detail) (USD $)
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]  
Amortized Cost, Total $ 38,887,986
Fair Value 37,701,356
Corporate Bonds [Member]
 
Schedule of Available-for-sale Securities [Line Items]  
Corporate and U.S. Government bonds 5 to 10 years, Amortized Cost 9,000,000
Corporate bonds 5 to 10 years, Fair Value 8,869,794
U. S. Government Agency Bonds [Member]
 
Schedule of Available-for-sale Securities [Line Items]  
Corporate and U.S. Government bonds 5 to 10 years, Amortized Cost 7,500,000
Corporate bonds 5 to 10 years, Fair Value 7,079,350
U. S. Government Agency Mortgage-Backed Securities [Member]
 
Schedule of Available-for-sale Securities [Line Items]  
Mortgage-backed securities, Amortized Cost 22,387,986
U.S. Government agency mortgage - backed securities, Fair Value $ 21,752,212