Pension and Profit Sharing - Periodic Benefit Cost (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Assumptions used to determine net periodic benefit cost:
Discount rate		3.23%	3.78%
Expected return on plan assets		6.00%	6.00%
Components of net periodic benefit expense:
Interest cost		$ 59,348	$ 69,806
Service cost	$ 1,000	25,000	25,000
Expected return on plan assets		(92,620)	(93,292)
Amortization of prior service costs		9,155	9,155
Amortization of actuarial loss		122,352	116,118
Net periodic benefit cost		$ 123,235	$ 126,787