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Fair Value Measurements - Schedule of Balances of Financial Assets Measured at Fair Value on a Recurring Basis (Detail) (USD $)
Jun. 30, 2013
Dec. 31, 2012
Securities available for sale:    
Securities available-for-sale $ 40,050,413 $ 36,700,520 [1]
U. S. Government Agencies [Member]
   
Securities available for sale:    
Securities available-for-sale 9,662,338 9,463,815
State and Municipal Obligations [Member]
   
Securities available for sale:    
Securities available-for-sale 27,366,674 23,849,528
Certificates of Deposit [Member]
   
Securities available for sale:    
Securities available-for-sale 1,989,401 1,987,177
Auction Rate Securities [Member]
   
Securities available for sale:    
Securities available-for-sale 1,032,000 1,400,000
Recorded Balance [Member]
   
Securities available for sale:    
Securities available-for-sale 40,050,413 36,700,520
Defined benefit plan assets:    
Cash and cash equivalents   2,844,808
Recorded Balance [Member] | Cash and Cash Equivalents [Member]
   
Defined benefit plan assets:    
Cash and cash equivalents   (5,539)
Recorded Balance [Member] | Fixed Income Funds [Member]
   
Defined benefit plan assets:    
Cash and cash equivalents   1,091,176
Recorded Balance [Member] | Equity Funds [Member]
   
Defined benefit plan assets:    
Cash and cash equivalents   1,759,171
Recorded Balance [Member] | U. S. Government Agencies [Member]
   
Securities available for sale:    
Securities available-for-sale 9,662,338 9,463,815
Recorded Balance [Member] | State and Municipal Obligations [Member]
   
Securities available for sale:    
Securities available-for-sale 27,366,674 23,849,528
Recorded Balance [Member] | Certificates of Deposit [Member]
   
Securities available for sale:    
Securities available-for-sale 1,989,401 1,987,177
Recorded Balance [Member] | Auction Rate Securities [Member]
   
Securities available for sale:    
Securities available-for-sale 1,032,000 1,400,000
Recorded Balance [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
   
Securities available for sale:    
Securities available-for-sale      
Defined benefit plan assets:    
Cash and cash equivalents   2,844,808
Recorded Balance [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Cash and Cash Equivalents [Member]
   
Defined benefit plan assets:    
Cash and cash equivalents   (5,539)
Recorded Balance [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fixed Income Funds [Member]
   
Defined benefit plan assets:    
Cash and cash equivalents   1,091,176
Recorded Balance [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity Funds [Member]
   
Defined benefit plan assets:    
Cash and cash equivalents   1,759,171
Recorded Balance [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U. S. Government Agencies [Member]
   
Securities available for sale:    
Securities available-for-sale      
Recorded Balance [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | State and Municipal Obligations [Member]
   
Securities available for sale:    
Securities available-for-sale      
Recorded Balance [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Certificates of Deposit [Member]
   
Securities available for sale:    
Securities available-for-sale      
Recorded Balance [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Auction Rate Securities [Member]
   
Securities available for sale:    
Securities available-for-sale      
Recorded Balance [Member] | Significant Other Observable Inputs (Level 2) [Member]
   
Securities available for sale:    
Securities available-for-sale 39,018,413 35,300,520
Defined benefit plan assets:    
Cash and cash equivalents     
Recorded Balance [Member] | Significant Other Observable Inputs (Level 2) [Member] | Cash and Cash Equivalents [Member]
   
Defined benefit plan assets:    
Cash and cash equivalents     
Recorded Balance [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fixed Income Funds [Member]
   
Defined benefit plan assets:    
Cash and cash equivalents     
Recorded Balance [Member] | Significant Other Observable Inputs (Level 2) [Member] | Equity Funds [Member]
   
Defined benefit plan assets:    
Cash and cash equivalents     
Recorded Balance [Member] | Significant Other Observable Inputs (Level 2) [Member] | U. S. Government Agencies [Member]
   
Securities available for sale:    
Securities available-for-sale 9,662,338 9,463,815
Recorded Balance [Member] | Significant Other Observable Inputs (Level 2) [Member] | State and Municipal Obligations [Member]
   
Securities available for sale:    
Securities available-for-sale 27,366,674 23,849,528
Recorded Balance [Member] | Significant Other Observable Inputs (Level 2) [Member] | Certificates of Deposit [Member]
   
Securities available for sale:    
Securities available-for-sale 1,989,401 1,987,177
Recorded Balance [Member] | Significant Other Observable Inputs (Level 2) [Member] | Auction Rate Securities [Member]
   
Securities available for sale:    
Securities available-for-sale      
Recorded Balance [Member] | Significant Unobservable Inputs (Level 3) [Member]
   
Securities available for sale:    
Securities available-for-sale 1,032,000 1,400,000
Defined benefit plan assets:    
Cash and cash equivalents     
Recorded Balance [Member] | Significant Unobservable Inputs (Level 3) [Member] | Cash and Cash Equivalents [Member]
   
Defined benefit plan assets:    
Cash and cash equivalents     
Recorded Balance [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fixed Income Funds [Member]
   
Defined benefit plan assets:    
Cash and cash equivalents     
Recorded Balance [Member] | Significant Unobservable Inputs (Level 3) [Member] | Equity Funds [Member]
   
Defined benefit plan assets:    
Cash and cash equivalents     
Recorded Balance [Member] | Significant Unobservable Inputs (Level 3) [Member] | U. S. Government Agencies [Member]
   
Securities available for sale:    
Securities available-for-sale      
Recorded Balance [Member] | Significant Unobservable Inputs (Level 3) [Member] | State and Municipal Obligations [Member]
   
Securities available for sale:    
Securities available-for-sale      
Recorded Balance [Member] | Significant Unobservable Inputs (Level 3) [Member] | Certificates of Deposit [Member]
   
Securities available for sale:    
Securities available-for-sale      
Recorded Balance [Member] | Significant Unobservable Inputs (Level 3) [Member] | Auction Rate Securities [Member]
   
Securities available for sale:    
Securities available-for-sale $ 1,032,000 $ 1,400,000
[1] Derived from the audited consolidated financial statements.