INCOME TAXES (Details) (USD $)	12 Months Ended
	Apr. 30, 2013	Apr. 30, 2012
Current:
Federal	$ 5,000	$ 22,000
State	3,000	3,000
Current Income Tax Expense (Benefit), Total	8,000	25,000
Deferred:
Federal	(1,327,000)	0
State	(228,000)	0
Total	(1,547,000)	25,000
Reconciliation of the expected income tax provision or benefit at the statutory federal income tax rate to the actual provision or benefit [Abstract]
Expected federal income tax provision (benefit)	528,000	428,000
State taxes, net of federal benefit	2,000	2,000
Permanent differences	11,000	10,000
Change in valuation allowance	(2,088,000)	(6,218,000)
Net operating loss carryover expiration	0	5,804,000
Other	0	(1,000)
Provision for (benefit of) income taxes	(1,547,000)	25,000
Decrease in the deferred tax assets	1,800,000
Deferred tax assets [Abstract]
Net operating loss, general business credit and AMT carryforwards	5,531,000	7,054,000
Deferred revenue	85,000	84,000
Reserves and accruals	1,188,000	1,445,000
Total	6,804,000	8,583,000
Deferred tax liabilities [Abstract]
Other	(52,000)	(24,000)
Net deferred tax assets before valuation allowance	6,752,000	8,559,000
Valuation allowance	(5,197,000)	(8,559,000)
Net deferred taxes	1,555,000	0
Tax Credit Carryforward [Line Items]
Minimum percentage of cumulative change in ownership limits federal credit and net operating loss carryforwards (in hundredths)	50.00%
Period over which cumulative change in ownership limits federal credit and net operating loss carryforwards	3 years
Interest and penalties	0	0
Federal [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	14,500,000
Net operating loss carryforwards, expiration dates	2018
Federal [Member] | Research and Development Credit Carryforwards [Member]
Tax Credit Carryforward [Line Items]
Tax credit carryforwards	284,000
Tax credit carryforwards, expiration date	Dec. 31, 2020
Federal [Member] | Alternative Minimum Tax Credit Carryforward [Member]
Tax Credit Carryforward [Line Items]
Tax credit carryforwards	137,000
California [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	1,600,000
Net operating loss carryforwards, expiration dates	2029
California [Member] | Research and Development Credit Carryforwards [Member]
Tax Credit Carryforward [Line Items]
Tax credit carryforwards	$ 158,000