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Income Taxes Other (Details) - USD ($) | 12 Months Ended
--- | ---
Apr. 30, 2022 | Apr. 30, 2021
Unrecognized tax benefits |  |
Federal net operating loss carryforwards | $ 88,863,000 |
State net operating loss carryforwards | 93,485,000 |
Foreign net operating loss carryforwards | 64,000 |
Operating loss not subject to expiration | 47,000 |
Operating losses subject to expiration | 93,438,000 |
Unrecognized tax benefits which would impact the Company's effective tax rate if recognized | 4,969,000 |
Increase in valuation allowance | 7,387,000 | $ 3,304,000
Activity related to gross unrecognized tax benefits |  |
Beginning balance | 17,556,000 | 14,347,000
Increases related to prior year tax positions | 415,000 | 1,305,000
Decreases related to prior year tax positions | (239,000) | (116,000)
Increases related to current year tax positions | 1,398,000 | 2,074,000
Decreases related to lapsing of statute of limitations | (1,324,000) | (54,000)
Ending balance | 17,806,000 | 17,556,000
Accrued interest and penalties related to unrecognized tax positions | 302,000 | 23,000
Statute of limitations expiration |  |
Unrecognized tax benefits |  |
Unrecognized tax benefits which would impact the Company's effective tax rate if recognized | 17,806,000 | $ 17,556,000
Increase in valuation allowance | 9,956,000 |
Estimated decrease in unrecognized tax benefits in the next twelve months | $ (3,263,000) |

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