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Retirement Agreements and Other Postretirement Benefit Plan Effects on Net Periodic Postretirement Benefit Cost and Accumulated Postretirement Benefit Obligation (Details)
 12 Months Ended
Dec. 31, 2017
USD ($)
Retirement Benefits [Abstract]  
One-Percent Point Increase: Effect on the service cost component $ 0
One-Percent Point Increase: Effect on interest cost 6,761
One-Percent Point Increase: Total effect on the net periodic postretirement benefit cost 6,761
One-Percent Point Decrease: Effect on the service cost component 0
One-Percent Point Decrease: Effect on interest cost (5,305)
One-Percent Point Decrease: Total effect on the net periodic postretirement benefit cost (5,305)
One-Percent Point Increase: Effect on those currently receiving benefits (retirees and spouses) 0
One-Percent Point Increase: Effect on active fully eligible 187,814
One-Percent Point Increase: Effect on actives not yet eligible 0
One-Percent Point Increase: Total effect on the accumulated postretirement benefit obligation 187,814
One-Percent Point Decrease: Effect on those currently receiving benefits (retirees and spouses) 0
One-Percent Point Decrease: Effect on active fully eligible (147,367)
One-Percent Point Decrease: Effect on actives not yet eligible 0
One-Percent Point Decrease: Total effect on the accumulated postretirement benefit obligation $ (147,367)