Pension and Profit Sharing - Periodic Benefit Cost (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Assumptions used to determine net periodic benefit cost:
Discount rate	2.74%	3.87%
Expected return on plan assets	6.00%	6.00%
Components of net benefit expense:
Service cost	$ 30,195	$ 25,000
Interest cost	27,671	41,841
Expected return on plan assets	(40,560)	(54,330)
Settlement cost	793,524
Amortization of prior service costs	538	544
Amortization of actuarial loss	56,739	90,442
Total non-service cost	837,912	78,497
Net periodic benefit cost:	$ 868,107	$ 103,497