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Consolidated Condensed Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Aug. 31, 2013
May 31, 2013
Receivables, allowance $ 5,742 $ 5,438
Intangible assets, accumulated amortization $ 9,985 $ 9,039
Preferred stock, shares authorized 500,000 500,000
Preferred stock, shares issued      
Common stock, par value $ 0.30 $ 0.30
Common stock, shares authorized 60,000,000 30,000,000
Common stock, shares issued 20,611,041 20,587,808
Treasury stock at cost, shares 89,569 89,569