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Investments In Securities (Schedule Of Gross Realized Gains And Losses On Securities) (Details) (USD $)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]          
Total, Gross realized gains     $ 139,639 $ 204,071  
Other than temporary impairment of securities     0 (76,539) (93,436)
Total, Gross realized losses     38,785 151,200  
Net realized gain from securities     100,854 52,871  
Impairments of other investments     (34,070) 0  
Gain on other investments     4,832 205,158  
Total     (29,238) 205,158  
Net Realized Gain 55,272 65,148 71,616 258,029  
General Obligations Of U.S. States, Territories And Political Subdivisions
          
Schedule of Available-for-sale Securities [Line Items]          
Total, Gross realized gains     0 250  
Corporate Debt Securities
          
Schedule of Available-for-sale Securities [Line Items]          
Total, Gross realized gains     20,476 0  
Common Stocks And Nonredeemable Preferred Stocks
          
Schedule of Available-for-sale Securities [Line Items]          
Total, Gross realized gains     119,163 163,764  
Common stocks and nonredeemable preferred stocks     (38,785) (74,661)  
Auction Rate Securities
          
Schedule of Available-for-sale Securities [Line Items]          
Total, Gross realized gains     $ 0 $ 40,057