Marketable Securities (Tables)

3 Months Ended

Jun. 30, 2012

Marketable Securities [Abstract]

Fair Value Of Marketable Securities By Maturity

Total		<1 Year		1–3 Years		3–5 Years
$	75,568,269	$	18,903,884	$	21,835,729	$	34,828,656

Amortized Cost And Approximate Fair Values Of Marketable Securities

	As of June 30, 2012									As of March 31, 2012
	Adjusted Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Market Value		Adjusted Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Market Value
Corporate bonds	$	56,809,785	$	1,368,667	$	(43,670	)	$	58,134,782	$	50,513,389	$	1,481,604	$	(76,434	)	$	51,918,559
Municipal bonds	17,185,016		249,168		(697		)	17,433,487		19,775,582		334,793		(32,007		)	20,078,368
Total	$	73,994,801	$	1,617,835	$	(44,367	)	$	75,568,269	$	70,288,971	$	1,816,397	$	(108,441	)	$	71,996,927

Gross Unrealized Losses And Fair Values Of Investments By Investment Category And Length Of Time

		Less Than 12 Months					12 Months or Greater					Total
		Fair Market Value		Gross Unrealized Losses			Fair Market Value		Gross Unrealized Losses			Fair Market Value		Gross Unrealized Losses
As of June 30, 2012
	Corporate bonds	$	11,144,803	$	(43,670	)	$	-	$	-		$	11,144,803	$	(43,670	)
	Municipal bonds	463,725		(697		)	-		-			463,725		(697		)
	Total	$	11,608,528	$	(44,367	)	$	-	$	-		$	11,608,528	$	(44,367	)
As of March 31, 2012
	Corporate bonds	$	10,387,955	$	(76,434	)		-		-		$	10,387,955	$	(76,434	)
	Municipal bonds	-		-			908,550		(32,007		)	908,550		(32,007		)
	Total	$	10,387,955	$	(76,434	)	$	908,550	$	(32,007	)	$	11,296,505	$	(108,441	)