Subsequent Event - Narrative (Details) - USD ($) |
Dec. 15, 2020 |
Oct. 31, 2020 |
Apr. 30, 2020 |
Oct. 31, 2019 |
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| Subsequent Event [Line Items] | Ìý | Ìý | Ìý | Ìý |
| Restricted cash | Ìý | $ 4,644,618 | $ 3,556,211 | $ 454,288 |
| Collateral Pledged, Bank Letter of Credit | Ìý | Ìý | Ìý | Ìý |
| Subsequent Event [Line Items] | Ìý | Ìý | Ìý | Ìý |
| Restricted cash | Ìý | $ 379,345 | $ 255,708 | Ìý |
| Collateral Pledged, Bank Letter of Credit | Subsequent Event | Ìý | Ìý | Ìý | Ìý |
| Subsequent Event [Line Items] | Ìý | Ìý | Ìý | Ìý |
| Restricted cash | $ 10,000 | Ìý | Ìý | Ìý |
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- Definition Amount of cash restricted as to withdrawal or usage, classified as current. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. No definition available.
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