Income Taxes (Schedule of Income Tax Reconciliation) (Details)	12 Months Ended
Apr. 30, 2019	Apr. 30, 2018
Income Tax Disclosure [Abstract]
Statutory U.S. federal income tax rate	21.00%	34.00%
State income taxes, net of federal tax benefit	3.60%	3.00%
Other	(0.80%)	(0.90%)
Effect of change in federal tax rates	0.00%	(13.00%)
Change in valuation allowance	(23.80%)	(23.10%)
Effective income tax rate	0.00%	0.00%

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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