UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY - 3 months ended Jul. 31, 2021 - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit
Beginning balance (shares) at Apr. 30, 2021		13,414,066
Beginning balance at Apr. 30, 2021	$ 7,428	$ 13	$ 79,945	$ (72,530)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(172)
Ending balance at Jul. 31, 2021	$ 7,538