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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Apr. 30, 2015
Apr. 30, 2014
Statement of Financial Position [Abstract]    
Allowance for receivables $ 171 $ 229
Common stock, par value $ 2.50 $ 2.50
Common stock, shares authorized 5,000,000 5,000,000
Common stock, shares issued 2,633,000 2,623,000
Common stock, shares outstanding 2,630,000 2,619,000
Treasury stock, shares 3,000 4,000