Marketable Securities (Gross Unrealized Losses And Fair Values Of Investments By Investment Category And Length Of Time) (Details) (USD $)	6 Months Ended	12 Months Ended
	Sep. 30, 2014	Mar. 31, 2014
Schedule of Investments [Line Items]
Marketable Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Market Value	$ 29,377,477	$ 36,180,425
Marketable Securities, Continuous Unrealized Loss Position, Less than 12 Months, Gross Unrealized Losses	(172,907)	(251,582)
Marketable Securities, Continuous Unrealized Loss Position, 12 Months or Greater, Fair Market Value	8,368,641
Marketable Securities, Continuous Unrealized Loss Position, 12 Months or Greater, Gross Unrealized Losses	(79,103)
Marketable Securities, Continuous Unrealized Loss Position, Fair Market Value, Total	37,746,118	36,180,425
Marketable Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Total	(252,010)	(251,582)
Corporate Bonds [Member]
Schedule of Investments [Line Items]
Marketable Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Market Value	29,377,477	34,761,683
Marketable Securities, Continuous Unrealized Loss Position, Less than 12 Months, Gross Unrealized Losses	(172,907)	(246,973)
Marketable Securities, Continuous Unrealized Loss Position, 12 Months or Greater, Fair Market Value	8,368,641
Marketable Securities, Continuous Unrealized Loss Position, 12 Months or Greater, Gross Unrealized Losses	(79,103)
Marketable Securities, Continuous Unrealized Loss Position, Fair Market Value, Total	37,746,118	34,761,683
Marketable Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Total	(252,010)	(246,973)
Municipal Bonds [Member]
Schedule of Investments [Line Items]
Marketable Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Market Value		1,418,742
Marketable Securities, Continuous Unrealized Loss Position, Less than 12 Months, Gross Unrealized Losses		(4,609)
Marketable Securities, Continuous Unrealized Loss Position, Fair Market Value, Total		1,418,742
Marketable Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Total		$ (4,609)