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Income Taxes Reconciliation (Details) - USD ($)
 12 Months Ended
Apr. 30, 2021
Apr. 30, 2020
Apr. 30, 2019
Income Taxes      
U.S. federal statutory income tax rate (as a percent) 21.00% 21.00% 21.00%
State and local income taxes, net of federal benefit (as a percent) (1.40%) (2.10%) (2.20%)
R&D and other tax credits (as a percent) (11.50%) (6.80%) (8.10%)
Valuation allowance (as a percent) 3.20% 3.40% 3.70%
Return to provision adjustments (as a percent) (0.30%) 0.10% (0.30%)
Permanent items (as a percent) 3.60% 0.70% 0.80%
Foreign derived intangible income (as a percent) (7.60%) (3.90%) (3.70%)
Excess benefit of stock options (as a percent) (5.70%) (1.50%) (3.10%)
Other (as a percent) 0.30% 0.20% 1.10%
Effective income tax rate (as a percent) 1.60% 11.10% 9.20%
Current:      
Federal $ 3,094,000 $ 3,005,000 $ 1,953,000
State 448,000 390,000 228,000
Current 3,542,000 3,395,000 2,181,000
Deferred:      
Federal (3,247,000) 2,063,000 1,945,000
State 244,000 421,000 551,000
Foreign   (31,000) (36,000)
Deferred (3,003,000) 2,453,000 2,460,000
Total income tax expense (benefit) 539,000 5,848,000 $ 4,641,000
Deferred income tax assets:      
Accrued expenses 4,422,000 3,337,000  
Stock based compensation 2,492,000 2,259,000  
Allowances, reserves, and other 1,482,000 1,784,000  
Outside basis difference 4,617,000 2,264,000  
Unrealized loss on securities 110,000 9,000  
Net operating loss and credit carry-forwards 33,155,000 12,832,000  
Intangibles basis   605,000  
Lease liability 5,645,000 2,282,000  
Total deferred income tax assets 51,923,000 25,372,000  
Deferred income tax liabilities:      
Fixed asset basis (10,286,000) (1,218,000)  
Revenue recognition   (3,112,000)  
Right of use assets (5,119,000) (1,965,000)  
Intangible basis (17,004,000)    
Total deferred income tax liabilities (32,409,000) (6,295,000)  
Valuation allowance (17,453,000) (14,149,000)  
Net deferred tax assets $ 2,061,000 $ 4,928,000