Marketable Securities (Gross Unrealized Losses And Fair Values Of Investments By Investment Category And Length Of Time) (Details) (USD $)	Dec. 31, 2012	Mar. 31, 2012
Schedule of Investments [Line Items]
Marketable Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Market Value	$ 3,739,361	$ 10,387,955
Marketable Securities, Continuous Unrealized Loss Position, Less than 12 Months, Gross Unrealized Losses	(27,166)	(76,434)
Marketable Securities, Continuous Unrealized Loss Position, 12 Months or Greater, Fair Market Value		908,550
Marketable Securities, Continuous Unrealized Loss Position, 12 Months or Greater, Gross Unrealized Losses		(32,007)
Marketable Securities, Continuous Unrealized Loss Position, Fair Market Value, Total	3,739,361	11,296,505
Marketable Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Total	(27,166)	(108,441)
Corporate Bonds [Member]
Schedule of Investments [Line Items]
Marketable Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Market Value	3,224,566	10,387,955
Marketable Securities, Continuous Unrealized Loss Position, Less than 12 Months, Gross Unrealized Losses	(20,869)	(76,434)
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	3,224,566	10,387,955
Marketable Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Total	(20,869)	(76,434)
Municipal Bonds [Member]
Schedule of Investments [Line Items]
Marketable Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Market Value	514,795
Marketable Securities, Continuous Unrealized Loss Position, Less than 12 Months, Gross Unrealized Losses	(6,297)
Marketable Securities, Continuous Unrealized Loss Position, 12 Months or Greater, Fair Market Value		908,550
Marketable Securities, Continuous Unrealized Loss Position, 12 Months or Greater, Gross Unrealized Losses		(32,007)
Marketable Securities, Continuous Unrealized Loss Position, Fair Market Value, Total	514,795	908,550
Marketable Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Total	$ (6,297)	$ (32,007)