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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data
Aug. 31, 2011
May 31, 2011
Consolidated Balance Sheets    
Accounts receivable, allowances $ 539 $ 485
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, shares authorized 5,000,000 5,000,000
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 45,000,000 45,000,000
Common stock, shares issued 25,185,429 24,985,657
Common stock, shares outstanding 25,185,429 24,985,657