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Annual report pursuant to Section 13 and 15(d)

Income Taxes - Narrative (Details)

v3.20.2
Income Taxes - Narrative (Details) - USD ($)
Apr. 30, 2020
Apr. 30, 2019
Apr. 30, 2018
Income Tax Disclosure [Abstract] Ìý Ìý Ìý
Valuation allowance $ 12,399,948 $ 10,051,034 $ 7,837,755
Net operating loss carry forwards 41,900,000 Ìý Ìý
Operating loss carryforwards subject to expiration $ 28,200,000 Ìý Ìý