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Income Taxes - Reconciliation of Provision for Income Taxes from Continuing Operations (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2026
Apr. 30, 2025
Apr. 30, 2024
Income Tax Disclosure [Abstract]      
Federal income taxes expected at the statutory rate $ 5,265 $ 4,041 $ 10,861
State income taxes, net of federal tax effects 189 [1] 1,406 (144)
Foreign derived intangible income (FDII) deductions (24)    
Nontaxable or nondeductible items 441    
Stock compensation   386 467
Business meals and entertainment   113 100
Research and development tax credit (312) (335) (281)
Amendments to prior year returns   0 (1,176)
Deferral adjustment for stock compensation 988    
Other 42 209 529
Total income tax expense $ 6,589 $ 5,820 $ 10,356
U.S. Federal Statutory Tax Rate, Percent 21.00% 21.00%  
State income taxes, net of federal tax effects, Percent [1] 0.80%    
Foreign derived intangible income (FDII) deductions, Percent (0.10%)    
Research & development and fuel, Percent 1.20%    
Nontaxable or nondeductible items, Percent 1.80%    
Deferral adjustment for stock compensation, Percent 3.80%    
Other, Percent 0.20%    
Total income tax expense, Percent 26.30%    
[1] State taxes in California, Louisiana, Minnesota, North Carolina, and Texas make up the majority (greater than 50%) of the tax effect in this category.