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Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Oct. 31, 2012
Apr. 30, 2012
Consolidated Balance Sheets [Abstract]    
Restricted cash $ 3,340 $ 3,334
Allowance for doubtful accounts receivable $ 1,096 $ 1,058
Preferred stock, par value $ 0.001 $ 0.001
Preferred stock, shares authorized 20,000,000 20,000,000
Preferred stock, shares issued      
Preferred stock, shares outstanding      
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 100,000,000 100,000,000
Common stock, shares issued 67,447,748 66,512,097
Common stock, shares outstanding 66,247,748 65,312,097
Treasury stock, shares 1,200,000 1,200,000