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Investments In Securities (Schedule Of Gross Realized Gains And Losses On Securities) (Details) (USD $)
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Schedule of Available-for-sale Securities [Line Items]    
Total, Gross realized gains $ 204,071 $ 299,226
Total, Gross realized losses (151,200) (110,881)
Net realized gain 52,871 188,345
Obligations Of States And Political Subdivisions [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total, Gross realized gains 250 20,846
Common Stocks And Nonredeemable Preferred Stocks [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total, Gross realized gains 163,764 262,952
Total, Gross realized losses (74,661) (46,413)
Auction Rate Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total, Gross realized gains 40,057 15,428
Other Than Temporary Impairment Of Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total, Gross realized losses $ (76,539) $ (64,468)