Accounts Receivable (Details) - USD ($) |
12 Months Ended | |
|---|---|---|
Apr. 30, 2019 |
Apr. 30, 2018 |
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| Receivables [Abstract] | 听 | 听 |
| Accounts receivable | $ 14,988,744 | $ 8,585,947 |
| Long term contractual accounts receivable | (3,085,243) | (1,315,050) |
| Less: Allowance for doubtful accounts | (1,247,031) | (468,174) |
| Accounts receivable, net | 10,656,470 | 6,802,723 |
| Bad debt expense | $ 854,008 | $ 535,366 |
| X | ||||||||||
- Definition Current portion of long term contractual receivable. No definition available.
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| X | ||||||||||
- Definition Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of allowance for credit loss on accounts receivable, classified as current. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of expense (reversal of expense) for expected credit loss on accounts receivable. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- References No definition available.
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