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Retirement Agreements and Other Postretirement Benefit Plan Effects on Net Periodic Postretirement Benefit Cost and Accumulated Postretirement Benefit Obligation (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]    
One-Percent Point Increase: Effect on the service cost component $ 2,600  
One-Percent Point Increase: Effect on interest cost 7,339  
One-Percent Point Increase: Total effect on the net periodic postretirement benefit cost 9,939  
One-Percent Point Decrease: Effect on the service cost component   $ (1,989)
One-Percent Point Decrease: Effect on interest cost   (5,721)
One-Percent Point Decrease: Total effect on the net periodic postretirement benefit cost   (7,710)
One-Percent Point Increase: Effect on those currently receiving benefits (retirees and spouses) 0  
One-Percent Point Increase: Effect on active fully eligible 81,657  
One-Percent Point Increase: Effect on actives not yet eligible 101,813  
One-Percent Point Increase: Total effect on the accumulated postretirement benefit obligation $ 183,470  
One-Percent Point Decrease: Effect on those currently receiving benefits (retirees and spouses)   0
One-Percent Point Decrease: Effect on active fully eligible   (65,192)
One-Percent Point Decrease: Effect on actives not yet eligible   (77,845)
One-Percent Point Decrease: Total effect on the accumulated postretirement benefit obligation   $ (143,037)