Condensed Consolidated Balance Sheets (Parentheticals) - USD ($) shares in Thousands, $ in Thousands	Jul. 31, 2015	Apr. 30, 2015
Allowance for doubtful accounts	$ 189	$ 189
Preferred stock, par value	$ 1.00	$ 1.00
Common stock, par value	$ 1.00	$ 1.00
Common stock shares issued	9,164	9,164
Treasury stock, shares	448	465