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Income Taxes Other (Details) - USD ($)
 12 Months Ended
Apr. 30, 2024
Apr. 30, 2023
Apr. 30, 2021
Unrecognized tax benefits      
Federal net operating loss carryforwards $ 2,464,000    
State net operating loss carryforwards 99,333,000    
Foreign net operating loss carryforwards 74,000    
Unrecognized tax benefits which would impact the Company's effective tax rate if recognized 5,139,000    
Increase in valuation allowance 1,332,000   $ 2,337,000
Activity related to gross unrecognized tax benefits      
Beginning balance 12,841,000 $ 17,806,000  
Decreases related to prior year tax positions (59,000) (379,000)  
Increases related to current year tax positions 2,060,000 1,257,000  
Decreases related to lapsing of statute of limitations (1,241,000) (5,843,000)  
Ending balance 13,601,000 12,841,000  
Accrued interest and penalties related to unrecognized tax positions 283,000 282,000  
Statute of limitations expiration      
Unrecognized tax benefits      
Unrecognized tax benefits which would impact the Company's effective tax rate if recognized 13,601,000 $ 12,841,000  
Increase in valuation allowance 6,517,000    
Estimated decrease in unrecognized tax benefits in the next twelve months $ (1,616,000)