Income Taxes (Narrative) (Details) - USD ($) |
12 Months Ended | |
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Apr. 30, 2017 |
Apr. 30, 2016 |
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| Operating Loss Carryforwards [Line Items] | ||
| Net change in the valuation allowance | $ 402,888 | $ 828,574 |
| Net operating loss carryforwards | $ 20,204,869 | |
| Earliest Tax Year [Member] | ||
| Operating Loss Carryforwards [Line Items] | ||
| Net operating loss carryforwards, expiration | Dec. 31, 2032 | |
| Years under examination | 2013 | |
| Latest Tax Year [Member] | ||
| Operating Loss Carryforwards [Line Items] | ||
| Net operating loss carryforwards, expiration | Dec. 31, 2037 | |
| Years under examination | 2016 | |
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- Definition Tax year being audited in the income tax examination, in CCYY format. No definition available.
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Expiration date of each operating loss carryforward included in operating loss carryforward, in CCYY-MM-DD format. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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