Investments In Securities (Schedule Of Gross Realized Gains And Losses On Securities) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Schedule of Available-for-sale Securities [Line Items]
Total, Gross realized gains			$ 955,824	$ 1,441,803
Total, Gross realized losses			(404,247)	(720,637)
Net realized gain from securities			551,577	721,166
Other Asset Impairment Charges			0	(233,069)
Gain on other investments			22,751	113,239
Total			22,751	(119,830)
Net realized gain on investments	$ 439,326	$ (338,631)	574,328	601,336
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			161	0
Total, Gross realized losses			(1,085)	(397)
Corporate Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Total, Gross realized gains			20	5,417
Common Stocks And Nonredeemable Preferred Stocks
Schedule of Available-for-sale Securities [Line Items]
Total, Gross realized gains			880,647	1,436,386
Total, Gross realized losses			(168,688)	(39,017)
Auction Rate Securities
Schedule of Available-for-sale Securities [Line Items]
Total, Gross realized gains			74,996	0
General Obligations Of U.S. States, Territories And Political Subdivisions
Schedule of Available-for-sale Securities [Line Items]
Total, Gross realized losses			(533)	(12,319)
Impairments of Debt And Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total, Gross realized losses			$ (233,941)	$ (668,904)