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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
Jul. 31, 2020
Apr. 30, 2020
Statement of Financial Position [Abstract]    
Allowance for receivables $ 612 $ 606
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) 2,762,000 2,754,000
Common stock, shares outstanding (in shares) 2,759,000 2,751,000
Treasury stock, shares (in shares) 3,000 3,000