Investments (Tables)

12 Months Ended

Mar. 31, 2014

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 cash, cash equivalents and available-for-sale investments by type of instrument (in thousands):

	March 31, 2014									March 31, 2013
	Amortized Cost		Gross Unrealized					Estimated Fair Value		Amortized Cost		Gross Unrealized					Estimated Fair Value
			Gains		Losses							Gains		Losses
Cash	$	65,867	$	—	$	—		$	65,867	$	8,529	$	—	$	—		$	8,529
Cash equivalents	5,672		—		—			5,672		10,536		—		—			10,536
U.S. Treasury securities and agency bonds	2,838		—		—			2,838		12,363		10		—			12,373
Corporate bonds	10,599		30		(2		)	10,627		15,567		63		(2		)	15,628
Mortgage-backed and asset-backed securities*	1,793		297		(16		)	2,074		3,655		355		(7		)	4,003
Closed-end bond funds	14,373		2,392		(402		)	16,363		21,914		5,340		(39		)	27,215
Preferred stock	2,406		736		—			3,142		4,878		2,314		—			7,192
	$	103,548	$	3,455	$	(420	)	$	106,583	$	77,442	$	8,082	$	(48	)	$	85,476
Reported as:
Cash and cash equivalents								$	71,539								$	19,065
Short-term investments available-for-sale								35,044									66,411
								$	106,583								$	85,476

* At March 31, 2014 and 2013, approximately $1.1 million and $1.4 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, 2014								March 31, 2013
	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Level 1
Cash	$	65,867	$	—	$	—	$	65,867	$	8,529	$	—	$	—	$	8,529
Cash equivalents	5,672		—		—		5,672		9,508		1,028		—		10,536
U.S. Treasury securities and agency bonds	2,838		—		—		2,838		12,373		—		—		12,373
Corporate bonds	—		10,627		—		10,627		—		15,628		—		15,628
Mortgage-backed and asset-backed securities	—		2,074		—		2,074		—		4,003		—		4,003
Closed-end bond funds	16,363		—		—		16,363		27,215		—		—		27,215
Preferred stock	—		3,142		—		3,142		—		7,192		—		7,192
	$	90,740	$	15,843	$	—	$	106,583	$	57,625	$	27,851	$	—	$	85,476

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

The following is a summary of the cost and estimated fair values of available-for-sale securities with stated maturities, which include U.S. Treasury securities and agency bonds, corporate bonds and mortgage-backed and asset-backed securities, by contractual maturity as of March 31, 2014 (in thousands):

	March 31, 2014
	Cost		Estimated Fair Value
Less than 1 year	$	6,888	$	7,024
Mature in 1 – 2 years	6,580		6,618
Mature in 3 – 5 years	529		542
Mature after 5 years	1,233		1,355
	$	15,230	$	15,539

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, 2014	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	$	—	$	—		$	—	$	—		$	—	$	—
Corporate bonds	992		(2		)	—		—			992		(2		)
Mortgage-backed and asset-backed securities	431		(16		)	—		—			431		(16		)
Closed-end bond funds	4,819		(333		)	405		(69		)	5,224		(402		)
	$	6,242	$	(351	)	$	405	$	(69	)	$	6,647	$	(420	)

	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	)