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Investments In Securities And Fair Value (Schedule Of Gross Realized Gains And Losses On Securities) (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]    
Total, Gross realized gains $ 714,168 $ 593,855
Total, Gross realized losses (185,411) (528,104)
Net realized gain 528,757 65,751
General Obligations Of U.S. States, Territories And Political Subdivisions [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total, Gross realized gains 250 386
Corporate Debt Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total, Gross realized gains 52,396 20,459
Common Stocks And Nonredeemable Preferred Stocks [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total, Gross realized gains 450,461 529,811
Total, Gross realized losses (91,975) (247,117)
Auction Rate Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total, Gross realized gains 211,061 43,199
Other Than Temporary Impairment Of Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total, Gross realized losses $ (93,436) $ (280,987)