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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
May 31, 2016
May 31, 2015
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts $ 0 $ 536
Common stock, par value $ 0.0277 $ 0.0277
Common stock, shares authorized 15,000,000 15,000,000
Common stock, shares issued 11,217,144 11,217,144
Treasury stock, shares 2,825,900 2,825,900