Income Taxes (Details) (USD $)	12 Months Ended
	Apr. 30, 2012	Apr. 30, 2011
Effective Income Tax Rate Reconciliation [Line Items]
Computed tax expense (benefit) at statutory rates	$ (5,000)	$ 228,000
Income Tax Reconciliation, Permanent Differences	11,000	10,000
Income Tax Reconciliation, Change in Effective Tax Rate	0	(481,000)
Income Tax Reconciliation, State Tax Credits and Other	5,000	0
Income Tax Reconciliation, Change in Deferred Tax Assets Valuation Allowance	(11,000)	(357,000)
Income Tax Expense (Benefit), Continuing Operations	$ 0	$ (600,000)