Fair Value Measurements (Details) (USD $)	Sep. 30, 2012	Dec. 31, 2011
Balance of financial assets and liabilities measured at fair value on a recurring basis
Fair value	$ 31,262,020	$ 41,799,121
U. S. Government agencies [Member]
Balance of financial assets and liabilities measured at fair value on a recurring basis
Fair value	8,282,190	8,795,066
State and municipal obligations [Member]
Balance of financial assets and liabilities measured at fair value on a recurring basis
Fair value	22,979,830	33,004,055
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Balance of financial assets and liabilities measured at fair value on a recurring basis
Fair value
Significant Other Observable Inputs (Level 2) [Member]
Balance of financial assets and liabilities measured at fair value on a recurring basis
Fair value	31,262,020	41,799,121
Significant Unobservable Inputs (Level 3) [Member]
Balance of financial assets and liabilities measured at fair value on a recurring basis
Fair value
Recorded Balance [Member] | U. S. Government agencies [Member]
Balance of financial assets and liabilities measured at fair value on a recurring basis
Fair value	8,282,190	8,795,066
Recorded Balance [Member] | State and municipal obligations [Member]
Balance of financial assets and liabilities measured at fair value on a recurring basis
Fair value	22,979,830	33,004,055
Recorded Balance [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U. S. Government agencies [Member]
Balance of financial assets and liabilities measured at fair value on a recurring basis
Fair value
Recorded Balance [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | State and municipal obligations [Member]
Balance of financial assets and liabilities measured at fair value on a recurring basis
Fair value
Recorded Balance [Member] | Significant Other Observable Inputs (Level 2) [Member] | U. S. Government agencies [Member]
Balance of financial assets and liabilities measured at fair value on a recurring basis
Fair value	8,282,190	8,795,066
Recorded Balance [Member] | Significant Other Observable Inputs (Level 2) [Member] | State and municipal obligations [Member]
Balance of financial assets and liabilities measured at fair value on a recurring basis
Fair value	22,979,830	33,004,055
Recorded Balance [Member] | Significant Unobservable Inputs (Level 3) [Member] | U. S. Government agencies [Member]
Balance of financial assets and liabilities measured at fair value on a recurring basis
Fair value
Recorded Balance [Member] | Significant Unobservable Inputs (Level 3) [Member] | State and municipal obligations [Member]
Balance of financial assets and liabilities measured at fair value on a recurring basis
Fair value