Accounts Receivable - Accounts Receivable Balance (Details) - USD ($) |
Apr. 30, 2021 |
Apr. 30, 2020 |
Apr. 29, 2015 |
Sep. 30, 2014 |
Sep. 16, 2011 |
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| Receivables [Abstract] | Ìý | Ìý | Ìý | Ìý | Ìý |
| Accounts receivable | $ 30,264,393 | $ 22,786,847 | Ìý | Ìý | Ìý |
| Long-term contractual accounts receivable | (10,249,833) | (6,701,136) | $ (671,291) | $ (772,793) | $ (772,793) |
| Accounts receivable, current | 20,014,560 | 16,085,711 | Ìý | Ìý | Ìý |
| Less: Allowance for doubtful accounts | (3,289,816) | (1,758,920) | Ìý | Ìý | Ìý |
| Accounts receivable, net | $ 16,724,744 | $ 14,326,791 | Ìý | Ìý | Ìý |
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- Definition Amount, before 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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- 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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- 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 noncurrent. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- 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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- Definition Amount of allowance for credit loss on accounts receivable. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- References No definition available.
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