Leases (Details - Components of lease) - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2023	Jul. 31, 2022
Leases [Abstract]
Operating lease cost	$ 1,140	$ 1,083
Variable lease cost	351	389
Short-term lease cost	36	130
Finance lease costs:
Amortization of right-of-use assets	54	54
Interest on lease liabilities	27	33
Total lease costs	$ 1,608	$ 1,689