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Income Taxes Reconciliation (Details) - USD ($) | 12 Months Ended
--- | ---
Apr. 30, 2024 | Apr. 30, 2023 | Apr. 30, 2022
Income Taxes |  |  |
U.S. federal statutory income tax rate (as a percent) | 21.00% | 21.00% | 21.00%
Foreign rate differential (as a percent) | (0.50%) | (0.10%) | 4.90%
State and local income taxes, net of federal benefit (as a percent) | 0.90% | 0.20% | 40.80%
R&D and other tax credits | (7.80%) | (1.80%) | 23.00%
Valuation allowance (as a percent) | 1.50% | 1.10% | (37.40%)
Return to provision adjustments (as a percent) | 1.60% |  | (0.90%)
Limit on executive compensation | 2.70% | (0.40%) | (2.40%)
Permanent items (as a percent) | 0.60% | (0.30%) | (0.90%)
Uncertain tax position adjustment (as a percent) | (0.60%) | 2.00% |
Foreign derived intangible income | (16.00%) | 2.30% |
Excess benefit of equity awards (as a percent) | (0.60%) | 0.80% | 5.20%
Goodwill impairment |  | (17.20%) |
Other (as a percent) | 0.20% | 0.20% | 0.90%
Effective income tax rate (as a percent) | 3.00% | 7.80% | 54.20%
Current: |  |  |
Federal | $ 20,990,000 | $ 1,510,000 | $ (3,025,000)
State | 1,511,000 | 1,474,000 | 165,000
Foreign | (76,000) | 2,273,000 | 279,000
Current | 22,425,000 | 5,257,000 | (2,581,000)
Deferred: |  |  |
Federal | (18,844,000) | (17,226,000) | (5,764,000)
State | (625,000) | (1,488,000) | 483,000
Foreign | (1,065,000) | (1,206,000) | (2,507,000)
Deferred | (20,534,000) | (19,920,000) | (7,788,000)
Total income tax (benefit) expense | 1,891,000 | (14,663,000) | $ (10,369,000)
Deferred income tax assets: |  |  |
Accrued expenses | 2,542,000 | 2,153,000 |
Stock based compensation | 3,391,000 | 2,380,000 |
Allowances, reserves, and other | 1,001,000 | (1,032,000) |
Outside basis difference | (33,000) |  |
Unrealized loss on securities | 3,588,000 | 3,528,000 |
Net operating loss and credit carry-forwards | 19,800,000 | 20,430,000 |
Capitalized research and development costs | 42,788,000 | 24,962,000 |
Reserve for inventory excess and obsolescence | 5,577,000 | 3,185,000 |
Lease liability | 7,628,000 | 6,960,000 |
Total deferred income tax assets | 86,282,000 | 62,566,000 |
Deferred income tax liabilities: |  |  |
Fixed asset basis | (3,516,000) | (4,999,000) |
Right of use assets | (7,053,000) | (6,478,000) |
Intangible basis | (11,239,000) | (3,109,000) |
Total deferred income tax liabilities | (21,808,000) | (14,586,000) |
Valuation allowance | (23,835,000) | (22,503,000) |
Net deferred tax assets | $ 40,639,000 | $ 25,477,000 |

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