Pension and Profit Sharing - Benefit Obligation (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Assumptions used to determine benefit obligation:
Discount rate		3.50%	3.23%
Changes in benefit obligation:
Benefit obligation at beginning of year	$ (1,776,788)	$ (1,904,377)	$ (1,886,636)
Interest cost		(59,348)	(69,806)
Service cost	(1,000)	(25,000)	(25,000)
Actuarial loss	$ (122,000)	(62,677)	(256,446)
Benefits and plan expenses paid		274,614	333,511
Benefit obligation at end of year		$ (1,776,788)	$ (1,904,377)