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Investments In Securities (Schedule Of Gross Realized Gains And Losses On Securities) (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Schedule of Available-for-sale Securities [Line Items]        
Total, Gross realized gains     $ 357,630 $ 945,563
Total, Gross realized losses     (233,276) (24,700)
Net realized gain from securities     124,354 920,863
Gain on other investments     10,648 19,104
Total     10,648 19,104
Net realized gain on investments $ (14,828) $ 925,164 135,002 939,967
General Obligations Of U.S. States, Territories And Political Subdivisions        
Schedule of Available-for-sale Securities [Line Items]        
Total, Gross realized losses     0 (12,319)
Issuer Obligations Of U S States Territories And Political Subdivisions Special Revenue [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Total, Gross realized gains     160 0
Total, Gross realized losses     (1,085) (398)
Corporate Debt Securities        
Schedule of Available-for-sale Securities [Line Items]        
Total, Gross realized gains     20 999
Common Stocks And Nonredeemable Preferred Stocks        
Schedule of Available-for-sale Securities [Line Items]        
Total, Gross realized gains     282,454 944,564
Total, Gross realized losses     (116,953) (834)
Impairments of Debt And Equity Securities [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Total, Gross realized losses     (115,238) (11,149)
Auction Rate Securities        
Schedule of Available-for-sale Securities [Line Items]        
Total, Gross realized gains     $ 74,996 $ 0