Pension and Profit Sharing - Benefit Obligation (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Assumptions used to determine benefit obligation:
Discount rate	2.74%	3.87%
Changes in benefit obligation:
Benefit obligation at beginning of year	$ (1,160,930)	$ (1,362,867)
Interest cost	(41,841)	(39,851)
Service cost	(25,000)	(33,000)
Actuarial (loss) gain	(46,288)	71,338
Benefits and plan expenses paid	200,743	203,450
Benefit obligation at end of year:	$ (1,073,316)	$ (1,160,930)