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CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($)
$ in Thousands
May. 31, 2015
May. 31, 2014
Statement of Financial Position [Abstract]    
Accounts receivable, allowances for doubtful accounts $ 468 $ 401
Preferred stock, par value (in dollars per share) $ 0 $ 0
Preferred stock, shares authorized (shares) 5,000,000 5,000,000
Preferred stock, shares issued (shares) 0 0
Common stock, par value (in dollars per share) $ 0 $ 0
Common stock, shares authorized (shares) 200,000,000 200,000,000
Common stock, shares issued (shares) 130,557,676 137,691,286
Common stock, shares outstanding (shares) 130,557,676 137,691,286