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Accrued Expenses
3 Months Ended
Jul. 31, 2011
Accrued Expenses [Abstract]  
Accrued Expenses
(7) Accrued Expenses:
Accrued expenses consisted of the following as of July 31, 2011 and April 30, 2011 (in thousands):
                 
    July 31, 2011        
    (Unaudited)     April 30, 2011  
Accrued rebates and promotions
  $ 2,036     $ 1,731  
Accrued professional fees
    3,446       4,585  
Accrued employee benefits
    2,627       2,690  
Accrued distributor incentives
    2,488       6,301  
Accrued environmental
    85       107  
Interest payable
    750       1,575  
Accrued workers’ compensation
    665       593  
Accrued utilities
    490       579  
Deferred revenue
    1,287       1,855  
Accrued commissions
    1,511       1,383  
Accrued severance/restructuring costs (Note 11)
    1,550       1,252  
Pension liability
    114       111  
Accrued other
    3,092       2,594  
 
           
Total accrued expenses
  $ 20,141     $ 25,356