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Retirement Agreements And Other Postretirement Benefits (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]          
Service cost - benefits earned during the year $ 0 $ 2,545 $ 0 $ 7,635  
Interest cost on the projected benefit obligation 9,217 8,781 27,651 26,343  
Amortization of unrecognized losses 2,153 2,235 6,459 6,705  
Net periodic benefits costs 11,370 $ 13,561 34,110 $ 40,683  
Employee benefits and other payments $ 9,538,000   $ 9,538,000   $ 8,487,000