Marketable Securities

12 Months Ended

Mar. 31, 2013

Marketable Securities [Abstract]

Marketable Securities

NOTE 4. MARKETABLE SECURITIES
     Marketable securities with remaining maturities less than one year are classified as short-term, and those with remaining maturities greater than one year are classified as long-term. The fair value of our marketable securities as of March 31, 2013, by maturity, were as follows:

Total		<1 Year		1–3 Years		3–5 Years
$	82,751,286	$	9,711,029	$	34,310,566	$	38,729,691

 
     As of March 31, 2013 and 2012 our marketable securities were as follows:

	As of March 31, 2013									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	$	72,923,502	$	2,378,845	$	(4,187	)	$	75,298,160	$	50,513,389	$	1,481,604	$	(76,434	)	$	51,918,559
Municipal bonds	7,381,223		81,058		(9,155		)	7,453,126		19,775,582		334,793		(32,007		)	20,078,368
Total	$	80,304,725	$	2,459,903	$	(13,342	)	$	82,751,286	$	70,288,971	$	1,816,397	$	(108,441	)	$	71,996,927

     The following table shows the gross unrealized losses and fair value of our investments with unrealized losses, aggregated by investment category and length of time that individual securities had been in a continuous unrealized loss position as of March 31, 2013 and 2012:

		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 March 31, 2013
	Corporate bonds	$	1,171,976	$	(4,187	)	$	-	$	-		$	1,171,976	$	(4,187	)
	Municipal bonds	508,607		(9,155		)	-		-			508,607		(9,155		)
	Total	$	1,680,583	$	(13,342	)	$	-	$	-		$	1,680,583	$	(13,342	)
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	)

 
     Gross unrealized losses totaled $13,342 as of March 31, 2013, and were attributed to one corporate bond and two municipal bonds out of a portfolio of 43 bonds. The gross unrealized losses were due to market-price decreases and rating downgrades after the bonds were purchased, and none had been in a continuous unrealized loss position for 12 months or greater. A substantial majority of the bonds we held were rated by Moody's or Standard and Poor's and had investment-grade credit ratings. For each bond with an unrealized loss, we expect to recover the entire cost basis of each security based on our consideration of factors including their credit ratings, the underlying ratings of insured bonds, and historical default rates for securities of comparable credit rating. Because we expect to recover the entire cost basis of the securities, and because we do not intend to sell the securities and it is not more likely than not that we will be required to sell the securities before recovery of the cost basis, which may be maturity, we did not consider any of our marketable securities to be other-than-temporarily impaired at March 31, 2013.