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Pension and Profit Sharing - Periodic Benefit Cost (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Assumptions used to determine net periodic benefit cost:      
Discount rate   3.50% 3.23%
Expected return on plan assets   6.00% 6.00%
Components of net benefit expense:      
Interest cost   $ 55,811 $ 59,348
Service cost $ 1,000 36,000 25,000
Expected return on plan assets   (76,138) (92,620)
Amortization of prior service costs   543 9,155
Amortization of actuarial loss   124,854 122,352
Net periodic benefit cost   $ 141,070 $ 123,235