Marketable Securities (Amortized Cost And Approximate Fair Values Of Marketable Securities) (Details) (USD $)	Mar. 31, 2014	Mar. 31, 2013
Schedule of Investments [Line Items]
Adjusted Cost	$ 93,003,640	$ 80,304,725
Gross Unrealized Gains	1,630,343	2,459,903
Gross Unrealized Losses	(251,582)	(13,342)
Fair Market Value	94,382,401	82,751,286
Corporate Bonds [Member]
Schedule of Investments [Line Items]
Adjusted Cost	88,567,210	72,923,502
Gross Unrealized Gains	1,613,822	2,378,845
Gross Unrealized Losses	(246,973)	(4,187)
Fair Market Value	89,934,059	75,298,160
Municipal Bonds [Member]
Schedule of Investments [Line Items]
Adjusted Cost	4,436,430	7,381,223
Gross Unrealized Gains	16,521	81,058
Gross Unrealized Losses	(4,609)	(9,155)
Fair Market Value	$ 4,448,342	$ 7,453,126