6. Income Taxes (Details Narrative) - USD ($) $ in Thousands	12 Months Ended
Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2017
Unrecognized tax benefits from uncertain tax positions	$ 0	$ 0	$ 0
Income tax penalties or interest	0	0	$ 0
Income tax penalties or interest accrued	$ 0	$ 0
U.S. corporate income tax rate	21.00%
Federal [Member]
Net operating loss carry forward	$ 425,841
Operating loss carryforward expiration dates	2020 through 2038
California [Member]
Net operating loss carry forward	$ 273,581
Operating loss carryforward expiration dates	2029

Operating loss carryforward expiration dates

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

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The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations.

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The sum of the amounts of estimated penalties and interest recognized in the period arising from income tax examinations.

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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Amount of unrecognized tax benefits.

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