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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Feb. 28, 2014
May 31, 2013
Accounts receivable, allowance $ 1,150 $ 900
Customer based intangibles, accumulated amortization 10,629 9,446
Other non-current assets, accumulated amortization $ 5,800 $ 4,222
Preferred stock, par value $ 1.00 $ 1.00
Preferred stock, shares authorized 100,000 100,000
Preferred stock, shares issued      
Preferred stock, shares outstanding      
Common stock, par value $ 0.16 $ 0.16
Common stock, shares authorized 60,000,000 60,000,000
Common stock, shares issued 36,643,516 36,084,021
Common stock, shares outstanding 36,643,516 36,084,021