Summary of Significant Accounting Policies (Tables)

12 Months Ended

Mar. 31, 2013

Summary of Significant Accounting Policies [Abstract]

Assets carried at fair value measured on a recurring basis

The following table provides the assets carried at fair value measured on a recurring basis at March 31:

Asset Class	Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
2013
Short-term investments:
U.S. Government and Agency debt securities	$	3,757,000	$	-	$	3,757,000	$	-
Long-term investments:
U.S. Government and Agency debt securities		3,452,000		-		3,452,000		-
2012
Short-term investments:
U.S. Government and Agency debt securities	$	1,001,000	$	-	$	1,001,000	$	-
Long-term investments:
U.S. Government and Agency debt securities		2,029,000		-		2,029,000		-

Amortized cost and fair value of marketable securities classified as available-for-sale

The amortized cost and fair value of our marketable securities classified as available-for-sale at March 31 are summarized as follows:

	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
2013
Short-term investments:
U.S. Government and Agency debt securities	$	3,756,000	$	1,000	$	-		$	3,757,000
Long-term investments:
U.S. Government and Agency debt securities		3,453,000		-		(1,000	)		3,452,000
Total	$	7,209,000	$	1,000	$	(1,000	)	$	7,209,000
2012
Short-term investments:
U.S. Government and Agency debt securities	$	1,001,000	$	-	$	-		$	1,001,000
Long-term investments:
U.S. Government and Agency debt securities		2,030,000		-		(1,000	)		2,029,000
Total	$	3,031,000	$	-	$	(1,000	)	$	3,030,000

Inventories

Inventories.  We state inventories at the lower of cost or market using the first-in, first-out method.  We value at lower of cost or market the slow moving and obsolete inventories based upon current and expected future product sales and the expected impact of product transitions or modifications.  Historically, the inventory write-offs have generally been within our expectations.  Inventories consist of the following at March 31:

	2013		2012
Raw materials	$	219,000	$	219,000
Work-in-process		21,000		1,000
Finished goods		479,000		479,000
	$	719,000	$	699,000

Components of property, plant, and equipment

Property, Plant, and Equipment.  We carry property, plant, and equipment, including leasehold improvements, at cost, less accumulated depreciation which consist of the following at March 31:

	2013			2012
Land	$	157,000		$	163,000
Building		716,000			745,000
Leasehold improvements		383,000			376,000
Internal use software		543,000			468,000
Equipment		1,374,000			1,315,000
		3,173,000			3,067,000
Less accumulated depreciation and amortization		(2,140,000	)		(1,895,000	)
	$	1,033,000		$	1,172,000

Intangible assets - patents

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
March 31, 2013	$	5,603,000	$	5,502,000	$	101,000
March 31, 2012		5,586,000		4,640,000		946,000

Future amortization expense

At March 31, 2013, we estimate the following annual amortization for these assets in subsequent fiscal years:

2014	$	27,000
2015		25,000
2016		23,000
2017		20,000
2018 and beyond		6,000
	$	101,000

Anti-dilutive securities excluded from diluted loss per common share

Basic and Diluted Net Loss per Share.  We calculate basic per common share amounts by dividing net loss by the weighted-average common shares outstanding, excluding outstanding shares contingently subject to forfeiture.  For calculating diluted per common share amounts, we add additional shares to the weighted-average common shares outstanding for the assumed exercise of stock options and vesting of restricted shares, if dilutive.  Because we had a net loss in fiscal 2013, 2012 and 2011, the following options outstanding and unvested restricted stock to purchase shares of our common stock were excluded from diluted net loss per common share because of their anti-dilutive effect, and therefore, basic net loss per common share equals dilutive net loss per common share:

	Number of options and unvested restricted stock		Rangeof exerciseprices
Years ended:
March 31, 2013		545,000	$	0.77 - $2.06
March 31, 2012		909,000	$	0.77 - $3.00
March 31, 2011		2,121,000	$	0.71 - $6.61