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Earnings Per Common Share And Share Awards Summary Of Share-Based Award Transactions (Details) - USD ($)
 9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Number Of Shares, Options exercised   (1,500)  
Number Of Shares, Unvested as of September 30, 2016 2,250    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]      
Weighted Average Exercise Price, Options exercised   $ 36.79  
Weighted Average Exercise Price, Unvested as of September 30, 2016 $ 93.87    
Average Remaining Contractual Term, Unvested as of September 30, 2016 6 years 7 months 17 days    
Aggregate Intrinsic Value, Unvested as of September 30, 2016 $ 12,667    
StockOptionsAndStockAppreciationRightsSARS [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Number Of Shares, Outstanding Beginning Balance 22,000 21,000  
Number Of Shares, Outstanding Ending Balance 24,500 22,000 21,000
Number Of Shares, Exercisable as of September 30, 2016 22,250    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]      
Weighted Average Exercise Price, Outstanding Beginning Balance $ 57.04 $ 51.30  
Weighted Average Exercise Price, Outstanding Ending Balance 65.85 $ 57.04 $ 51.30
Weighted Average Exercise Price, Exercisable as of September 30, 2016 $ 63.02    
Average Remaining Contractual Term, Outstanding Beginning Balance 4 years 1 month 6 days 3 years 11 months 4 days 3 years 7 months 20 days
Average Remaining Contractual Term, Outstanding Ending Balance 4 years 1 month 6 days 3 years 11 months 4 days 3 years 7 months 20 days
Average Remaining Contractual Term, Exercisable as of September 30, 2016 3 years 10 months 6 days    
Aggregate Intrinsic Value, Outstanding Beginning Balance $ 945,055 $ 453,510  
Aggregate Intrinsic Value, Outstanding Ending Balance 824,390 $ 945,055 $ 453,510
Aggregate Intrinsic Value, Exercisable as of September 30, 2016 $ 811,723    
SARs      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Number Of Shares, SARs granted 4,500 4,500  
Number Of Shares, Options exercised (2,000) (2,000)  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]      
Weighted Average Exercise Price, SARs granted $ 93.87 $ 73.00  
Weighted Average Exercise Price, Options exercised $ 32.00 $ 47.88