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Retirement Agreements and Other Postretirement Benefit Plan Development of the Accumulated Postretirement Benefit Obligation (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Accrued postretirement benefit obligation at beginning of year $ (882,623) $ (771,537)  
Service cost – benefits earned during the year (10,180) (16,748) $ (14,667)
Interest cost on projected benefit obligation (35,123) (30,772) (30,472)
Actuarial loss (566) (63,566)  
Accrued postretirement benefit obligation at end of year $ (928,492) $ (882,623) $ (771,537)