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Note 6 - Long-term Debt and Capital Leases (Tables)
 12 Months Ended
May 31, 2016
Notes Tables  
Schedule of Long-term Debt Instruments [Table Text Block]
   
2016
    
2015
  
           
(as adjusted)
  
Senior unsecured notes
  
$
212,546
     $ 215,000  
Unamortized discount
  
 
(1,771
)
     (2,162 )
Unamortized debt issuance costs
  
 
(2,995
)
     (3,656 )
Senior unsecured notes less unamortized discount and
 
                
debt issuance costs
  
 
207,780
       209,182  
Revolving credit facility
  
 
–
       –  
Mortgage loan obligations
  
 
15,745
       31,607  
Unamortized premium - mortgage loan obligations
  
 
75
       383  
Unamortized debt issuance costs - mortgage loan obligations
  
 
(74
)
     (283 )
Capital lease obligations
  
 
211
       206  
Total long-term debt and capital leases  
 
223,737
       241,095  
Less current maturities
  
 
9,934
       10,078  
Long-term debt and capital leases, less current maturities  
$
213,803
     $ 231,017  
Schedule of Maturities of Long-term Debt and Capital Lease Obligations [Table Text Block]
201
7
   $ 10,971  
201
8
     1,525  
201
9
     1,519  
20
20
     213,642  
20
21
     503  
Subsequent years
     342  
    $ 228,502