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Income Taxes Other (Details) - USD ($)	12 Months Ended
	Apr. 30, 2021	Apr. 30, 2020
Unrecognized tax benefits
Federal net operating loss carryforwards	$ 88,719,000
State net operating loss carryforwards	24,685,000
Foreign net operating loss carryforwards	341,000
Operating loss not subject to expiration	8,754,000
Operating losses subject to expiration	15,931,000
Activity related to gross unrecognized tax benefits
Beginning balance	14,347,000	$ 12,593,000
Increases related to prior year tax positions	1,305,000	62,000
Decreases related to prior year tax positions	(116,000)
Increases related to current year tax positions	2,074,000	1,971,000
Decreases related to lapsing of statute of limitations	(54,000)	(279,000)
Ending balance	17,556,000	14,347,000
Accrued interest and penalties related to unrecognized tax positions	23,000	21,000
Statute of limitations expiration
Unrecognized tax benefits
Unrecognized tax benefits which would impact the Company's effective tax rate if recognized	17,556,000	$ 14,347,000
Estimated decrease in unrecognized tax benefits in the next twelve months	$ (1,324,000)

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