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Stockholder's Equity - Narrative (Details) - USD ($)
 12 Months Ended
Apr. 30, 2026
Apr. 30, 2025
Mar. 12, 2025
Aug. 31, 2023
Equity [Abstract]        
Common stock, shares authorized (in shares) 5,000,000 5,000,000    
Common stock, par value (in USD per share) $ 2.50 $ 2.50    
Common stock, shares outstanding (in shares) 2,866,000 2,839,000    
Number of Shares authorized to be repurchased (in shares)       100,000
Treasury stock (in shares) 0 33,206    
Treasury stock, value   $ 1,594,000    
Number of shares authorized to be repurchased 100,603      
Number of additional shares authorized to be repurchased     100,000