Earnings Per Share - Calculations of Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Apr. 30, 2024	Apr. 30, 2023
Basic and diluted net loss per share computation (dollars in thousands):
Net loss attributable to common stockholders	$ (7,276)	$ (5,335)
Weighted average common shares outstanding, basic (in shares)	13,547,604	13,541,559
Weighted average common shares outstanding, diluted (in shares)	13,547,604	13,541,559
Basic net (loss) per share (in usd per share)	$ (0.54)	$ (0.39)
Diluted net (loss) per share (in usd per share)	$ (0.54)	$ (0.39)