Income Taxes (Deferred Tax Asset Valuation Allowance Rollforward) (Details) - USD ($) |
12 Months Ended | |
|---|---|---|
Apr. 30, 2019 |
Apr. 30, 2018 |
|
| Income Tax Disclosure [Abstract] | Ìý | Ìý |
| Valuation allowance, beginning of year | $ (7,837,755) | $ (9,471,662) |
| Decrease (increase) during period | (2,213,279) | 1,633,907 |
| Valuation allowance, ending balance | $ (10,051,034) | $ (7,837,755) |
| X | ||||||||||
- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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