Intangible Assets

6 Months Ended

Sep. 30, 2011

Intangible Assets [Abstract]

Intangible Assets

6. Intangible Assets

Our intangible assets are comprised of patents which we amortize on a straight-line basis over their estimated useful lives of six years.

	Gross carrying amount		Accumulated amortization			Net value
September 30, 2011	$	5,575,000	$	(4,209,000	)	$	1,366,000
March 31, 2011		5,508,000		(3,783,000	)		1,725,000

At September 30, 2011, we estimate the following annual amortization for these assets in subsequent fiscal years:

Remainder of 2012	$	430,000
2013		860,000
2014		21,000
2015		20,000
2016 and beyond		35,000
	$	1,366,000