Investments (Tables)

3 Months Ended

Dec. 31, 2012

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 December 31, 2012 and September 30, 2012 were as follows (in thousands):

	December 31, 2012
	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
U.S. government and government agency obligations	$	32,930	$	220	$	—		$	33,150
Mortgage-backed securities		2,653		114		(24	)		2,743
Municipal bonds		3,671		30		—			3,701
Asset-backed securities		559		—		(10	)		549
Corporate bonds		2,414		25		—			2,439
Total	$	42,227	$	389	$	(34	)	$	42,582

	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 December 31, 2012 were as follows (in thousands):

	Amortized Cost		Fair Value
Debt securities due within:
One year	$	9,473	$	9,496
One to five years		29,476		29,726
Five years or more		3,278		3,360
Total	$	42,227	$	42,582

Sales of Available-for-Sale Securities

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

	Three months  ended December 31,
	2012		2011
Proceeds from sales	$	805	$	2,641
Gross realized gains	$	4	$	9
Gross realized losses	$	—	$	—