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Investments In Securities (Schedule Of Gross Realized Gains And Losses On Securities) (Details) (USD $)
9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Schedule of Available-for-sale Securities [Line Items]    
Total, Gross realized gains $ 321,175 $ 343,944
Total, Gross realized losses (168,514) (355,686)
Net realized gain 152,661 (11,742)
Obligations Of States And Political Subdivisions [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Total, Gross realized gains 2,862 20,845
Common Stocks And Nonredeemable Preferred Stocks [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Total, Gross realized gains 199,977 279,899
Total, Gross realized losses (91,975) (141,609)
Auction Rate Securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Total, Gross realized gains 118,336 43,200
Other Than Temporary Impairment Of Securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Total, Gross realized losses $ (76,539) $ (214,077)