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Background, Basis of Presentation and Liquidity (Details Narrative) - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2023	Jul. 31, 2022	Apr. 30, 2023
Accounting Policies [Abstract]
Net loss	$ 7,039	$ 5,852
Cash in operations	7,990	$ 5,092
Accumulated deficit	287,135		$ 280,096
Cash	3,900
Short-term investments	$ 22,790		$ 27,790

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