CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical)  | 
12 Months Ended | 
|---|---|
| 
 Apr. 30, 2020  
USD ($) 
 | |
| Statement of Stockholders' Equity [Abstract] | Ìý | 
| Underwriter costs | $ 1,222,371 | 
| X | ||||||||||
- Definition Noncash Stock Issuance Costs No definition available. 
  | 
| X | ||||||||||
- References No definition available. 
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