Marketable Securities (Amortized Cost And Approximate Fair Values Of Marketable Securities) (Details) (USD $)	Sep. 30, 2014	Mar. 31, 2014
Schedule of Investments [Line Items]
Adjusted Cost	$ 98,284,085	$ 93,003,640
Gross Unrealized Gains	1,144,069	1,630,343
Gross Unrealized Losses	(252,010)	(251,582)
Fair Market Value	99,176,144	94,382,401
Corporate Bonds [Member]
Schedule of Investments [Line Items]
Adjusted Cost	95,870,410	88,567,210
Gross Unrealized Gains	1,137,401	1,613,822
Gross Unrealized Losses	(252,010)	(246,973)
Fair Market Value	96,755,801	89,934,059
Municipal Bonds [Member]
Schedule of Investments [Line Items]
Adjusted Cost	2,413,675	4,436,430
Gross Unrealized Gains	6,668	16,521
Gross Unrealized Losses		(4,609)
Fair Market Value	$ 2,420,343	$ 4,448,342