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Note 9 - Commitments and Contingencies (Tables)
12 Months Ended
May. 31, 2015
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
   
Amount
 
FY 2016
  $ 3,136  
FY 2017
    2,631  
FY 2018
    1,768  
FY 2019
    1,003  
FY 2020
    257  
Thereafter
    624  
Total
  $ 9,419