Investments (Tables)

6 Months Ended

Mar. 31, 2013

Amortized Cost, Unrealized Holding Gains (Losses) and Fair Value of Available-for-Sale Securities

The amortized cost, unrealized holding gains and losses, and fair value of available-for-sale securities as of March 31, 2013 and September 30, 2012 were as follows (in thousands):

	March 31, 2013
	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
U.S. government and government agency obligations	$	34,318	$	59	$	—		$	34,377
Mortgage-backed securities		2,513		112		(24	)		2,601
Municipal bonds		3,421		27		(1	)		3,447
Asset-backed securities		537		—		(5	)		532
Corporate bonds		1,673		23		—			1,696
Total	$	42,462	$	221	$	(30	)	$	42,653
	September 30, 2012
	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
U.S. government and government agency obligations	$	28,641	$	213	$	—		$	28,854
Mortgage-backed securities		2,896		129		(26	)		2,999
Municipal bonds		3,178		35		—			3,213
Asset-backed securities		613		—		(15	)		598
Corporate bonds		6,858		28		—			6,886
Total	$	42,186	$	405	$	(41	)	$	42,550

Amortized Cost and Fair Value of Investments by Contractual Maturity

The amortized cost and fair value of investments by contractual maturity at March 31, 2013 were as follows (in thousands):

	Amortized Cost		Fair Value
Debt securities due within:
One year	$	15,132	$	15,147
One to five years		23,951		24,040
Five years or more		3,379		3,466
Total	$	42,462	$	42,653

Sales of Available-for-Sale Securities

The following table summarizes sales of available-for-sale securities (in thousands):

	Three months ended					Six months ended
	March 31,					March 31,
	2013		2012			2013		2012
Proceeds from sales	$	25,175	$	31,913		$	25,980	$	34,554
Gross realized gains	$	161	$	163		$	165	$	171
Gross realized losses	$	—	$	(1	)	$	—	$	(1	)