Marketable Securities (Tables)

9 Months Ended

12 Months Ended

Dec. 31, 2012

Mar. 31, 2012

Marketable Securities [Abstract]

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

				Gross Unrealized		Gross Unrealized		Estimated Fair
		Cost		Gains		Losses		Value
Marketable securities	$	21,385	$	2,320	$	6	$	23,699

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

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	$	1,125	$	6
Securities in a continuous loss position for more than 12 months		-		-
	$	1,125	$	6