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Note 17 - Commitments and Contingencies (Tables)
3 Months Ended
Aug. 31, 2014
Commitments and Contingencies Disclosure [Abstract]  
Long-term Purchase Commitment [Table Text Block]

2015

  $ 20,680  

2016

    4,185  

2017

    3,683  

2018

    3,883  

2019

    4,083