Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	Apr. 30, 2023	Apr. 30, 2022
Tax Credit Carryforward [Line Items]
Valuation allowance	$ 5,573	$ 5,122
Foreign Tax Authority [Member]
Tax Credit Carryforward [Line Items]
Valuation allowance	300
Gross amount of state tax credit carryforwards	2,200	1,900
State [Member]
Tax Credit Carryforward [Line Items]
Gross amount of state tax credit carryforwards	3,600	3,700
Net deferred tax assets related to tax credit carryforwards	300	400
State [Member] | Other Liabilities [Member]
Tax Credit Carryforward [Line Items]
Net deferred tax assets related to tax credit carryforwards	$ 300	$ 400