Debt (Details - Interest expense) - USD ($) $ in Thousands		12 Months Ended
		Apr. 30, 2023	Apr. 30, 2022	Apr. 30, 2021
Debt Instrument [Line Items]
Amortization of debt discount		$ 1,046	$ 1,030	$ 916
Convertible Notes [Member]
Debt Instrument [Line Items]
Contractual interest expense		1,395	1,603	245
Amortization of issuance costs		1,046	1,030	54
Amortization of debt discount	[1]	0	0	862
Total interest expense associated with Convertible Notes		$ 2,441	$ 2,633	$ 1,161

[1] As discussed above, the adoption of ASU 2020-06 on May 1, 2021 resulted in the re-combination of the debt and equity components of the Convertible Notes into a single debt instrument. Accordingly, the unamortized debt discount balance and the net carrying amount of the equity component were derecognized.