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Background, Basis of Presentation and Liquidity (Details Narrative) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2023	Oct. 31, 2022	Oct. 31, 2023	Oct. 31, 2022	Apr. 30, 2023
Accounting Policies [Abstract]
Net loss	$ 7,213	$ 4,844	$ 14,252	$ 10,696
Cash in operations			15,495	$ 11,001
Accumulated deficit	294,348		294,348		$ 280,096
Cash	3,500		3,500
Short-term investments	$ 15,427		$ 15,427		$ 27,790

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