Marketable Securities (Amortized Cost And Approximate Fair Values Of Marketable Securities) (Details) (USD $)	Jun. 30, 2014	Mar. 31, 2014
Schedule of Investments [Line Items]
Adjusted Cost	$ 95,408,449	$ 93,003,640
Gross Unrealized Gains	1,598,921	1,630,343
Gross Unrealized Losses	(71,192)	(251,582)
Fair Market Value	96,936,178	94,382,401
Corporate Bonds [Member]
Schedule of Investments [Line Items]
Adjusted Cost	92,984,777	88,567,210
Gross Unrealized Gains	1,589,079	1,613,822
Gross Unrealized Losses	(71,192)	(246,973)
Fair Market Value	94,502,664	89,934,059
Municipal Bonds [Member]
Schedule of Investments [Line Items]
Adjusted Cost	2,423,672	4,436,430
Gross Unrealized Gains	9,842	16,521
Gross Unrealized Losses		(4,609)
Fair Market Value	$ 2,433,514	$ 4,448,342