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Income Taxes (Details - Provision for Income taxes) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2023
Apr. 30, 2022
Apr. 30, 2021
Income Tax Disclosure [Abstract]      
Federal income taxes at statutory rate $ 421 $ 2,659 $ 2,355
State income taxes, net of valuation allowance 301 605 0
Expiration and adjustments of deferred tax assets 0 0 451
Change in federal valuation allowance 0 (122,703) 2,450
Stock-based compensation including 162M limitations 615 (1,153) (240)
Research and development credits 0 0 (4,958)
Adjustment for federal benefit of state 0 5,326 0
Permanent differences 66 425 4
Other, net 40 (170) (62)
Income tax expense (benefit) $ 1,443 $ (115,011) $ (0)