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Earnings Per Share - Calculations of Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Jan. 31, 2021
Jan. 31, 2021
Apr. 30, 2021
Apr. 30, 2020
Basic and diluted net loss per share computation (dollars in thousands):        
Net income (loss) attributable to common stockholders $ 959 $ 1,035 $ 362 $ (2,093)
Weighted Average common shares - basic (in shares)     13,138,995 11,843,463
Basic net income (loss) per share (in usd per share) $ 0.07 $ 0.08 $ 0.03 $ (0.18)
Diluted income (loss) per share computation        
Net income (loss) attributable to common stockholders     $ 362 $ (2,093)
Weighted Average common shares (in shares)     13,138,995 11,843,463
Incremental shares from assumed exercise of warrants and stock options (in shares)     1,434,566 0
Adjusted weighted average share - diluted (in shares)     14,573,561 11,843,463
Diluted net income (loss) per share (in usd per share) $ 0.07 $ 0.07 $ 0.02 $ (0.18)