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Investments In Securities And Fair Value (Schedule Of Gross Unrealized Gains And Losses And Amortized Cost For Securities) (Details) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Available-for-sale, at fair value, Amortized Cost $ 75,573,673 $ 78,783,968
Available-for-sale, at fair value, Gross Unrealized Gains 6,388,510 6,785,882
Available-for-sale, at fair value, Gross Unrealized Losses 25,205 162,485
Available-for-sale, at fair value, Estimated Fair Value 81,936,978 85,407,365
Equity Securities, available-for-sale at fair value, Amortized Cost 21,229,114 17,652,745
Equity Securities, available-for-sale at fair value, Gross Unrealized Gains 7,373,056 4,939,053
Equity Securities, available-for-sale at fair value, Gross Unrealized Losses 91,237 41,823
Equity Securities, available-for-sale at fair value, Estimated Fair Value 28,510,933 22,549,975
Short-term investments, Amortized Cost 13,567,648 14,112,262
Short-term investments, Gross Unrealized Gains 0 0
Short-term investments, Gross Unrealized Losses 0 0
Short-term investments, Estimated Fair Value 13,567,648 14,112,262
General Obligations Of U.S. States, Territories And Political Subdivisions [Member]
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Available-for-sale, at fair value, Amortized Cost 38,658,463 41,469,367
Available-for-sale, at fair value, Gross Unrealized Gains 3,211,445 3,595,144
Available-for-sale, at fair value, Gross Unrealized Losses 0 64
Available-for-sale, at fair value, Estimated Fair Value 41,869,908 45,064,447
Issuer Obligations Of U.S. States, Territories And Political Subdivisions Special Revenue [Member]
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Available-for-sale, at fair value, Amortized Cost 18,933,299 20,573,562
Available-for-sale, at fair value, Gross Unrealized Gains 1,909,106 1,988,589
Available-for-sale, at fair value, Gross Unrealized Losses 10,455 13,805
Available-for-sale, at fair value, Estimated Fair Value 20,831,950 22,548,346
Corporate Debt Securities [Member]
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Available-for-sale, at fair value, Amortized Cost 17,064,697 12,188,639
Available-for-sale, at fair value, Gross Unrealized Gains 1,252,973 1,202,149
Available-for-sale, at fair value, Gross Unrealized Losses 14,750 148,616
Available-for-sale, at fair value, Estimated Fair Value 18,302,920 13,242,172
Auction Rate Securities [Member]
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Available-for-sale, at fair value, Amortized Cost 917,214 4,552,400
Available-for-sale, at fair value, Gross Unrealized Gains 14,986 0
Available-for-sale, at fair value, Gross Unrealized Losses 0 0
Available-for-sale, at fair value, Estimated Fair Value 932,200 4,552,400
Common Stocks And Nonredeemable Preferred Stocks [Member]
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Equity Securities, available-for-sale at fair value, Amortized Cost 21,229,114 17,652,745
Equity Securities, available-for-sale at fair value, Gross Unrealized Gains 7,373,056 4,939,053
Equity Securities, available-for-sale at fair value, Gross Unrealized Losses 91,237 41,823
Equity Securities, available-for-sale at fair value, Estimated Fair Value 28,510,933 22,549,975
Certificates Of Deposit And Other [Member]
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Short-term investments, Amortized Cost 13,567,648 14,112,262
Short-term investments, Gross Unrealized Gains 0 0
Short-term investments, Gross Unrealized Losses 0 0
Short-term investments, Estimated Fair Value $ 13,567,648 $ 14,112,262