| Significant Accounting Policies - Narrative (Details) | 9 Months Ended | ||
|---|---|---|---|
| Jan. 31, 2023  USD ($)  segment | Jan. 31, 2022  USD ($) | Apr. 30, 2022  USD ($) | |
| Accounting Policies [Abstract] | 听 | 听 | 听 | 
| Cash, uninsured amount | $ 2,718,846 | 听 | $ 7,749,715 | 
| Number of reportable segments | segment | 1 | 听 | 听 | 
| Tenant improvements allowance received | $ 418,000 | $ 816,591 | 听 | 
| X | ||||||||||
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- References No definition available. 
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| X | ||||||||||
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- Definition The amount of cash as of the balance sheet date that is not insured by the Federal Deposit Insurance Corporation. No definition available. 
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| X | ||||||||||
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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef 
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| X | ||||||||||
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- Definition Amount of cash outflow for the allowance granted to lessee and/or direct costs incurred by lessor used to prepare the leased premises for tenant's occupancy. No definition available. 
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