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Investments In Securities Investments In Securities (Schedule Of Fair Value Assets Measured On Recurring Basis) (Details) - USD ($)
Sep. 30, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term Investments $ 20,692,763 $ 6,558,840
Available-for-sale Securities, Equity Securities 45,116,461 41,179,259
Available-for-sale Securities, Debt Securities 100,730,446 101,934,077
Assets, Fair Value Disclosure 166,539,670 149,672,176
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term Investments 20,692,763 6,558,840
Assets, Fair Value Disclosure 65,809,224 47,738,099
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term Investments 0 0
Assets, Fair Value Disclosure 100,730,446 101,934,077
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term Investments 0 0
Assets, Fair Value Disclosure 0 0
Common Stock    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Equity Securities 45,116,461 41,179,259
Common Stock | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Equity Securities 45,116,461 41,179,259
Common Stock | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Equity Securities 0 0
Common Stock | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Equity Securities 0 0
General Obligations Of U.S. States, Territories And Political Subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Debt Securities 86,909,832 88,093,996
General Obligations Of U.S. States, Territories And Political Subdivisions | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Debt Securities 0 0
General Obligations Of U.S. States, Territories And Political Subdivisions | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Debt Securities 86,909,832 88,093,996
General Obligations Of U.S. States, Territories And Political Subdivisions | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Debt Securities 0 0
Corporate Debt Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Debt Securities 13,820,614 13,840,081
Corporate Debt Securities | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Debt Securities 0 0
Corporate Debt Securities | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Debt Securities 13,820,614 13,840,081
Corporate Debt Securities | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Debt Securities $ 0 $ 0