XML 18 R7.htm IDEA: XBRL DOCUMENT v3.3.1.900
Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Jan. 31, 2016
Apr. 30, 2015
Statement of Financial Position [Abstract]    
Allowance for receivables $ 171 $ 171
Common stock, par value $ 2.50 $ 2.50
Common stock, shares authorized 5,000,000 5,000,000
Common stock, shares issued 2,688,000 2,633,000
Common stock, shares outstanding 2,685,000 2,630,000
Treasury stock, shares 3,000 3,000