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Investments In Securities (Schedule Of Gross Realized Gains And Losses On Securities) (Details) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Total, Gross realized gains $ 67,876 $ 192,881
Total, Gross realized losses (37,879) 0
Net realized gain 29,997 192,881
General Obligations Of U.S. States, Territories And Political Subdivisions [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total, Gross realized gains 0 250
Common Stocks And Nonredeemable Preferred Stocks [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total, Gross realized gains 67,876 152,574
Total, Gross realized losses (37,879) 0
Auction Rate Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total, Gross realized gains $ 0 $ 40,057