Income Taxes - Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2023	Apr. 30, 2022	Apr. 30, 2021
Current:
Federal	$ 5,205	$ 1,294	$ 693
State	1,352	615	386
Total current income tax expense	6,557	1,909	1,079
Deferred:
Federal	(3,666)	(712)	(238)
State	(426)	(142)	(82)
Total deferred income tax expense	(4,092)	(854)	(320)
Income tax expense	$ 2,465	$ 1,055	$ 759