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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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