Income Taxes (Details) (USD $)	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Income Taxes
Domestic	$ (2,877,000)	$ (3,534,000)	$ (3,232,000)
Foreign	12,000	85,000	401,000
Loss before income taxes	(2,865,000)	(3,449,000)	(2,830,000)
Current
Federal			1,000
State			(2,000)
Foreign	76,000	69,000	56,000
Total current provision	76,000	69,000	55,000
Deferred
Foreign	1,000	29,000	94,000
Total deferred provision	1,000	29,000	94,000
Total	77,000	98,000	149,000
Reconciliation of the provisions for income taxes at the statutory rates to the Company's provisions for income taxes
Expected U.S. Federal tax benefit (as a percent)	(34.00%)	(34.00%)	(34.00%)
State taxes (as a percent)	(4.30%)	(4.30%)	(4.30%)
Foreign taxes (as a percent)	2.70%	2.00%	5.20%
Change in valuation allowance (as a percent)	38.80%	34.10%	41.00%
Research and experimentation credit (as a percent)	(8.30%)	(3.20%)	(9.20%)
Stock-based compensation expense (as a percent)	7.50%	8.00%	6.10%
Other (as a percent)	0.20%	0.20%	0.50%
Actual effective tax rate (as a percent)	2.60%	2.80%	5.30%
Deferred tax assets:
Net operating loss carryforwards	15,926,000	17,572,000	19,035,000
Accruals and allowances recognized in different periods	323,000	373,000	162,000
Research and experimentation credit carryforwards	5,438,000	5,013,000	4,937,000
Property and equipment	73,000	109,000	138,000
Stock-based compensation expense	1,225,000	855,000	688,000
Total deferred tax assets	22,985,000	23,922,000	24,960,000
Less valuation allowance	(22,387,000)	(23,532,000)	(24,519,000)
Total deferred assets	598,000	390,000	441,000
Deferred tax liabilities:
Currency translation adjustment	(125,000)	(129,000)	(137,000)
Intangibles	(224,000)
Total deferred tax liabilities	(349,000)	(129,000)	(137,000)
Net deferred tax assets	249,000	261,000	304,000
Additional disclosures
Decrease in valuation allowance	(1,200,000)	(1,000,000)	(1,200,000)
Excess income tax benefits from stock option exercises	$ 0	$ 0	$ 0