Significant Accounting Policies (Narrative) (Details) - USD ($) |
9 Months Ended | ||
|---|---|---|---|
Jan. 31, 2018 |
Jan. 31, 2017 |
Apr. 30, 2017 |
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| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | |||
| Cash insured by FDIC | $ 250,000 | $ 250,000 | |
| Amount of cash balance uninsured by FDIC | $ 3,594,104 | $ 2,687,461 | |
| Employee Stock Option [Member] | |||
| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | |||
| Antidilutive securities | 2,872,546 | 1,963,481 | |
| Warrant [Member] | |||
| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | |||
| Antidilutive securities | 743,773 | 934,555 | |
| Convertible Debt [Member] | |||
| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | |||
| Antidilutive securities | 4,167 | 75,596 | |
| Convertible debt | $ 50,000 | $ 350,000 | |
| Sales Revenue, Net [Member] | Non-US [Member] | |||
| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | |||
| Percentage of revenues from students outside the United States | 2.10% | ||
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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. 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 The amount of cash deposited in financial institutions as of the balance sheet date that is insured by the Federal Deposit Insurance Corporation. No definition available.
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- Definition The amount of cash as of the balance sheet date that is not insured by the Federal Deposit Insurance Corporation. No definition available.
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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Including the current and noncurrent portions, carrying amount of debt identified as being convertible into another form of financial instrument (typically the entity's common stock) as of the balance sheet date, which originally required full repayment more than twelve months after issuance or greater than the normal operating cycle of the company. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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