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Income Taxes Other (Details) - USD ($)	12 Months Ended
	Apr. 30, 2023	Apr. 30, 2022
Unrecognized tax benefits
Federal net operating loss carryforwards	$ 7,001,000
State net operating loss carryforwards	93,289,000
Foreign net operating loss carryforwards	64,000
Unrecognized tax benefits which would impact the Company's effective tax rate if recognized	5,076,000
Increase in valuation allowance	2,337,000	$ 7,387,000
Activity related to gross unrecognized tax benefits
Beginning balance	17,806,000	17,556,000
Increases related to prior year tax positions		415,000
Decreases related to prior year tax positions	(379,000)	(239,000)
Increases related to current year tax positions	1,257,000	1,398,000
Decreases related to lapsing of statute of limitations	(5,843,000)	(1,324,000)
Ending balance	12,841,000	17,806,000
Accrued interest and penalties related to unrecognized tax positions	282,000	302,000
Statute of limitations expiration
Unrecognized tax benefits
Unrecognized tax benefits which would impact the Company's effective tax rate if recognized	12,841,000	$ 17,806,000
Increase in valuation allowance	5,986,000
Estimated decrease in unrecognized tax benefits in the next twelve months	$ (1,244,000)

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible domestic operating loss carryforwards. Excludes state and local operating loss carryforwards.

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