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Employee Benefit Plans (Details 1) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Components of net pension cost        
Pension Expense (actual) $ 329,953 $ 227,592 $ 659,907 $ 455,185
Actual [Member] | Pension plans, defined benefit [Member]
        
Components of net pension cost        
Service - cost benefits earned during the year       930,691
Interest costs on projected benefit obligations       603,903
Expected return on plan assets       (705,767)
Amortization of prior service cost       78,628
Amortization of unrecognized net loss         
Net periodic pension expense       907,455
Estimated [Member] | Pension plans, defined benefit [Member]
        
Components of net pension cost        
Service - cost benefits earned during the year     1,202,624  
Interest costs on projected benefit obligations     667,642  
Expected return on plan assets     (721,457)  
Amortization of prior service cost     78,628  
Amortization of unrecognized net loss     92,378  
Net periodic pension expense     $ 1,319,815