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Note 11 - Fair Value (Details) (USD $)
3 Months Ended 3 Months Ended 12 Months Ended
Aug. 31, 2013
May 31, 2013
Aug. 31, 2012
May 31, 2012
Aug. 31, 2013
Geographic Concentration Risk [Member]
United States [Member]
May 31, 2013
Geographic Concentration Risk [Member]
United States [Member]
Aug. 31, 2013
Notes [Member]
May 31, 2013
Notes [Member]
Aug. 31, 2013
Term Loans [Member]
May 31, 2013
Term Loans [Member]
Note 11 - Fair Value (Details) [Line Items]                    
Cash and Cash Equivalents, at Carrying Value $ 24,002,000 $ 29,388,000 $ 18,143,000 $ 18,578,000            
Concentration Risk, Percentage         37.00% 38.00%        
Long-term Debt, Fair Value             440,300,000 452,300,000 663,300,000 669,100,000
Business Combination, Contingent Consideration Arrangement, Fair Value Disclosure 4,400,000                  
Business Combination, Acquisition Related Costs $ (1,320,000)