4. Leases (Details Narrative) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2019
Lessee Disclosure [Abstract]
Operating lease expense			$ 2,900
Operating lease payments	$ 3,000	$ 3,100
Loss on lease termination	$ 0	$ (355)	$ 0