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Summary of Significant Accounting Policies - Reconciliation of Basic to Diluted Weighted Average Common Shares Outstanding (Detail) - shares
12 Months Ended
Apr. 30, 2022
Apr. 30, 2021
Earnings Per Share [Abstract]    
Anti-dilutive options exclude from computation of earning per share 44,750 166,880
Weighted average common shares outstanding    
Basic (in shares) 2,786,000 2,760,000
Dilutive effect of stock options and RSUs (in shares) 0 0
Weighted average common shares outstanding-diluted (in shares) 2,786,000 2,760,000