Pension and Profit Sharing - Benefit Obligation (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Assumptions used to determine benefit obligation:
Discount rate	2.74%	2.74%
Changes in benefit obligation:
Benefit obligation at beginning of year	$ (1,073,316)	$ (1,160,930)
Interest cost	(27,671)	(41,841)
Service cost	(30,195)	(25,000)
Actuarial loss	(160,884)	(46,288)
Benefits and plan expenses paid	203,596	200,743
Curtailments, settlements and special termination benefits	1,088,470
Benefit obligation at end of year:	$ (1,073,316)	$ (1,073,316)