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Note 21 - Commitments and Contingencies (Tables)
 12 Months Ended
May 31, 2012
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
Year Ending May 31:
     
2013
  $ 3,870  
2014
    3,174  
2015
    2,803  
2016
    2,459  
2017
    916  
Thereafter
    1,281  
    $ 14,503