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Earnings Per Share - Calculations of Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Apr. 30, 2019
Apr. 30, 2018
Basic and diluted net loss per share computation (dollars in thousands):    
Net income (loss) attributable to common stockholders $ 128 $ (1,476)
Weighted Average common shares - basic (in shares) 11,340,184 10,991,105
Basic net income (loss) per share (in usd per share) $ 0.01 $ (0.13)
Diluted income (loss) per share computation    
Net income (loss) attributable to common stockholders $ 128 $ (1,476)
Weighted Average common shares (in shares) 11,340,184 10,991,105
Incremental shares from assumed exercise of warrants and stock options (in shares) 2,755,933 0
Adjusted weighted average share - diluted (in shares) 14,096,117 10,991,105
Diluted net income (loss) per share (in usd per share) $ 0.01 $ (0.13)