Investments in U.S. Treasury Securities (Tables)

9 Months Ended

Jul. 31, 2012

Investments in U.S. Treasury Securities [Abstract]

Investment [Table Text Block]

The following table summarizes the amortized cost basis and fair value (based on quoted market prices) at July 31, 2012 and October 31, 2011:

	Amortized cost		Gross unrealized gains		Gross unrealized (losses)		Fair value
U.S. government obligations
As of July 31, 2012	$	—	$	—	$	—	$	—
As of October 31, 2011	$	12,016	$	14	$	—	$	12,030