Assumptions used to estimate fair value of stock warrants granted (Details)  Warrant Assumptions Used [Member] 
9 Months Ended  

Jan. 31, 2023 
Jan. 31, 2022 

Class of Warrant or Right [Line Items]  
ShareBased Compensation Arrangement by ShareBased Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum  0.85%  
ShareBased Compensation Arrangement by ShareBased Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum  0.79%  
ShareBased Compensation Arrangement by ShareBased Payment Award, Fair Value Assumptions, Expected Dividend Rate  
ShareBased Compensation Arrangement by ShareBased Payment Award, Fair Value Assumptions, Expected Term  5 years  
ShareBased Compensation Arrangement by ShareBased Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum  223.17%  
ShareBased Compensation Arrangement by ShareBased Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum  222.45% 
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 Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.

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 Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. Reference 1: http://www.xbrl.org/2003/role/disclosureRef

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 Definition The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probabilityweighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. No definition available.

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 Definition The estimated measure of the minimum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probabilityweighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. No definition available.

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 Definition The maximum riskfree interest rate assumption that is used in valuing an option on its own shares. No definition available.

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 Definition The minimum riskfree interest rate assumption that is used in valuing an option on its own shares. No definition available.

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 Definition Expected term of award under sharebased payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/disclosureRef

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 Details
