Investments (Tables)

12 Months Ended

Mar. 31, 2013

Investments, Debt and Equity Securities [Abstract]

Schedule of Cash, cash equivalents and available-for-sale investments by type of instruments

The following is a summary of available-for-sale securities (in thousands):

	March 31, 2013								March 31, 2012
	Amortized Cost		Gross Unrealized				Estimated Fair Value		Amortized Cost		Gross Unrealized				Estimated Fair Value
			Gains		Losses						Gains		Losses
Cash	$	8,529	$	—	$	—	$	8,529	$	15,057	$	—	$	—	$	15,057
Cash equivalents	10,536		—		—		10,536		13,008		—		—		13,008
U.S. Treasury securities and agency bonds	12,363		10		—		12,373		16,771		11		19		16,763
Corporate bonds	15,567		63		2		15,628		23,361		56		10		23,407
Mortgage-backed and asset-backed securities*	3,655		355		7		4,003		7,308		364		61		7,611
Closed-end bond funds	21,914		5,340		39		27,215		26,401		5,161		1,649		29,913
Preferred stock	4,878		2,314		—		7,192		6,209		1,878		—		8,087
	$	77,442	$	8,082	$	48	$	85,476	$	108,115	$	7,470	$	1,739	$	113,846
Reported as:
Cash and cash equivalents							$	19,065							$	28,065
Short-term investments available-for-sale							66,411								85,781
							$	85,476							$	113,846

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* At March 31, 2013 and 2012, approximately $1.4 million and $4.6 million of the estimated fair value presented were mortgage-backed securities, respectively.

Schedule of Cash, cash equivalents and available-for-sale investments by type of instruments measured at fair value on recurring basis

The following is a summary of cash, cash equivalents and available-for-sale investments by type of instruments measured at fair value on a recurring basis (in thousands):

	March 31, 2013								March 31, 2012
	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
Cash	$	8,529			$	—	$	8,529	$	15,057	$	—	$	—	$	15,057
Cash equivalents	9,508		1,028		—		10,536		10,510		2,498		—		13,008
U.S. Treasury securities and agency bonds	12,373				—		12,373		16,763		—		—		16,763
Corporate bonds			15,628		—		15,628		—		23,407		—		23,407
Mortgage-backed and asset-backed securities			4,003		—		4,003		—		7,611		—		7,611
Closed-end bond funds	27,215				—		27,215		29,913		—		—		29,913
Preferred stock			7,192		—		7,192		—		8,087		—		8,087
	$	57,625	$	27,851	$	—	$	85,476	$	72,243	$	41,603	$	—	$	113,846

Schedule of Cost and estimated fair values of available-for-sale securities with stated maturities by contractual maturity

At March 31, 2013, the cost and estimated fair values of available-for-sale securities with stated maturities are U.S. Treasury securities and agency bonds, corporate bonds and mortgage-backed and asset-backed securities by contractual maturity are as follows (in thousands):

	Cost		Fair Value
Less than 1 year	$	9,205	$	9,217
Mature in 1 – 2 years	19,843		20,040
Mature in 3 – 5 years	1,575		1,649
Mature after 5 years	962		1,098
	$	31,585	$	32,004

Schedule of Gross unrealized losses

The following is a summary of gross unrealized losses (in thousands):

	Less Than 12 Months of Unrealized Losses					12 Months or More of Unrealized Losses					Total
As of March 31, 2013	Estimated Fair Value		Gross Unrealized Losses			Estimated Fair Value		Gross Unrealized Losses			Estimated Fair Value		Gross Unrealized Losses
U.S. Treasury securities and agency bonds	$	300	$	—		$	—	$	—		$	300	$	—
Corporate bonds	2,276		(2		)	113		—			2,389		(2		)
Mortgage-backed and asset-backed securities	647		(3		)	—		(4		)	647		(7		)
Closed-end bond funds	—		—			6,991		(39		)	6,991		(39		)
	$	3,223	$	(5	)	$	7,104	$	(43	)	$	10,327	$	(48	)

	Less Than 12 Months of Unrealized Losses					12 Months or More of Unrealized Losses					Total
March 31, 2012	Estimated Fair Value		Gross Unrealized Losses			Estimated Fair Value		Gross Unrealized Losses			Estimated Fair Value		Gross Unrealized Losses
U.S. Treasury securities and agency bonds	$	8,938	$	(19	)	$	—	$	—		$	8,938	$	(19	)
Corporate bonds	5,463		(10		)	—		—			5,463		(10		)
Mortgage-backed and asset-backed securities	894		(20		)	353		(42		)	1,247		(62		)
Closed-end bond funds	—		—			6,628		(1,648		)	6,628		(1,648		)
	$	15,295	$	(49	)	$	6,981	$	(1,690	)	$	22,276	$	(1,739	)