Retirement Agreements and Other Postretirement Benefit Plan Components of Net Periodic Benefit Cost (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Compensation and Retirement Disclosure [Abstract]
Service cost - benefits earned during the year	$ 16,748	$ 14,667	$ 15,782
Interest cost on the projected benefit obligation	30,772	30,472	28,412
(Accretion) amortization of unrecognized prior service cost	4,390	2,217	(1,518)
Amortization of unrecognized losses	3,514	0	6,293
Net periodic benefits costs	$ 55,424	$ 47,356	$ 48,969