Marketable Securities (Tables)

3 Months Ended

6 Months Ended

Jun. 30, 2012

Sep. 30, 2012

Marketable Securities [Abstract]

Schedule Of Available For Sale Securities Reconciliation [Table Text Block]

		Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Marketable securities	$	23,183	$	2,249	$	39	$	25,393

				Gross Unrealized		Gross Unrealized		Estimated Fair
		Cost		Gains		Losses		Value
Marketable securities	$	22,153	$	2,538	$	62	$	24,629

Schedule of Unrealized Loss on Investments [Table Text Block]

		Aggregate		Unrealized
		Fair Value		Losses
Securities in a continuous loss position for less than 12 months	$	-	$	-
Securities in a continuous loss position for more than 12 months		1,048		62
	$	1,048	$	62