Marketable Securities (Gross Unrealized Losses And Fair Values Of Investments By Investment Category And Length Of Time) (Details) (USD $)	Mar. 31, 2014	Mar. 31, 2013
Schedule of Investments [Line Items]
Marketable Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Market Value	$ 36,180,425	$ 1,680,583
Marketable Securities, Continuous Unrealized Loss Position, Less than 12 Months, Gross Unrealized Losses	(251,582)	(13,342)
Marketable Securities, Continuous Unrealized Loss Position, Fair Market Value, Total	36,180,425	1,680,583
Marketable Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Total	(251,582)	(13,342)
Corporate Bonds [Member]
Schedule of Investments [Line Items]
Marketable Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Market Value	34,761,683	1,171,976
Marketable Securities, Continuous Unrealized Loss Position, Less than 12 Months, Gross Unrealized Losses	(246,973)	(4,187)
Marketable Securities, Continuous Unrealized Loss Position, 12 Months or Greater, Fair Market Value
Marketable Securities, Continuous Unrealized Loss Position, 12 Months or Greater, Gross Unrealized Losses
Marketable Securities, Continuous Unrealized Loss Position, Fair Market Value, Total	34,761,683	1,171,976
Marketable Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Total	(246,973)	(4,187)
Municipal Bonds [Member]
Schedule of Investments [Line Items]
Marketable Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Market Value	1,418,742	508,607
Marketable Securities, Continuous Unrealized Loss Position, Less than 12 Months, Gross Unrealized Losses	(4,609)	(9,155)
Marketable Securities, Continuous Unrealized Loss Position, Fair Market Value, Total	1,418,742	508,607
Marketable Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Total	$ (4,609)	$ (9,155)