Pension and Profit Sharing - Periodic Benefit Cost (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Assumptions used to determine net periodic benefit cost:
Discount rate	3.87%	3.14%
Expected return on plan assets	6.00%	6.00%
Components of net benefit expense:
Service cost	$ 25,000	$ 33,000
Interest cost	41,841	39,851
Expected return on plan assets	(54,330)	(67,547)
Amortization of prior service costs	544	543
Amortization of actuarial loss	90,442	87,360
Total non-service cost	78,497	60,207
Net periodic benefit cost:	$ 103,497	$ 93,207