Investments (Tables)

9 Months Ended

Jun. 30, 2012

Investments [Abstract]

Schedule of unrealized holding gains and losses, and fair value of available-for-sale securities

The original cost, unrealized holding gains and losses, and fair value of available-for-sale securities as of June 30, 2012 and September 30, 2011 were as follows (in thousands):

	June 30, 2012
	Original Cost		Unrealized Gains		Unrealized Losses			Fair Value
U.S. government and government agency obligations	$	32,614	$	161	$	(1	)	$	32,774
Mortgage-backed securities		3,212		129		(36	)		3,305
Municipal bonds		3,183		30		(1	)		3,212
Asset-backed securities		955		1		(46	)		910
Corporate bonds		2,100		22		(3	)		2,119
Total	$	42,064	$	343	$	(87	)	$	42,320

	September 30, 2011
	Original Cost		Unrealized Gains		Unrealized Losses			Fair Value
U.S. government and government agency obligations	$	30,433	$	176	$	(6	)	$	30,603
Mortgage-backed securities		3,871		131		(54	)		3,948
Municipal bonds		3,561		53		—			3,614
Asset-backed securities		1,336		1		(49	)		1,288
Corporate bonds		2,474		32		(9	)		2,497
Total	$	41,675	$	393	$	(118	)	$	41,950

Schedule of original cost and fair value of investments by contractual maturity

The original cost and fair value of investments by contractual maturity at June 30, 2012 were as follows (in thousands):

	Amortized Cost		Fair Value
Debt securities due within:
One year	$	13,509	$	13,519
One to five years		24,346		24,545
Five years or more		4,209		4,256
Total	$	42,064	$	42,320

Schedule of sales available-for-sale securities

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

	Three months ended June 30,					Nine months ended June 30,
	2012			2011		2012			2011
Proceeds from sales	$	649		$	23,247	$	35,203		$	47,827
Gross realized gains	$	3		$	171	$	174		$	383
Gross realized losses	$	(1	)	$	—	$	(2	)	$	(4	)