Treasury Stock - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended	1 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Jun. 02, 2011 Maximum
Stockholders Equity Note [Line Items]
Common stock authorized for repurchase			$ 2,000,000
Repurchase of common stock, shares	27,433	75,026
Repurchase of common stock, weighted average cost	$ 5.49	$ 5.39
Repurchase of common stock, value	$ 151,000	$ 405,000