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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
Jan. 31, 2024
Apr. 30, 2023
Current Assets:    
Allowance for receivables $ 589 $ 476
Stockholders' Equity:    
Common stock, par value (in dollars per share) $ 2.50 $ 2.50
Common stock, shares authorized (in shares) 5,000,000 5,000,000
Common stock, shares issued (in shares) 2,908,000 2,833,000
Common stock, shares outstanding (in shares) 2,875,000 2,830,000
Treasury stock, shares (in shares) 33,000 3,000