SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) |
12 Months Ended | |
|---|---|---|
Apr. 30, 2017 |
Apr. 30, 2016 |
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| Valuation and Qualifying Accounts [Abstract] | ||
| Deferred tax assets, beginning balance | $ 16,673,732 | $ 13,126,337 |
| Additions charged to costs and expenses | 0 | 0 |
| Charged to other accounts | 1,701,238 | 3,547,395 |
| Deductions | (1,974,510) | 0 |
| Deferred tax assets, ending balance | $ 16,400,460 | $ 16,673,732 |
| X | ||||||||||
- Definition Deferred tax assets additions charged to costs and expenses No definition available.
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| X | ||||||||||
- Definition Deferred tax assets charged to other accounts No definition available.
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| X | ||||||||||
- Definition Deferred tax assets, deductions No definition available.
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| X | ||||||||||
- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- References No definition available.
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