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Real Estate Assets (Details)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended 45 Months Ended
Jun. 09, 2017
USD ($)
ft²
Apr. 28, 2017
USD ($)
a
May 31, 2017
USD ($)
a
May 31, 2016
USD ($)
May 31, 2017
USD ($)
a
May 31, 2016
USD ($)
Nov. 30, 2013
USD ($)
a
May 31, 2017
USD ($)
a
Nov. 30, 2016
USD ($)
Real Estate Assets                  
Land     $ 16,502   $ 16,502     $ 16,502 $ 17,895
Land improvements     26,936   26,936     26,936 27,592
Buildings and improvements     165,937   165,937     165,937 164,353
Tenant improvements     24,705   24,705     24,705 21,925
Machinery and equipment     11,022   11,022     11,022 11,022
Construction in progress     1,962   1,962     1,962 1,659
Development costs     14,736   14,736     14,736 14,615
Real estate assets, gross     261,800   261,800     261,800 259,061
Accumulated depreciation     (90,581)   (90,581)     (90,581) (86,801)
Real estate assets, net     171,219   171,219     $ 171,219 172,260
Depreciation expense     $ 2,112 $ 1,898 $ 4,207 $ 3,782      
Capitalized interest       $ 133   217      
Sales                  
Number of acres sold | a     29   29     29  
Cash received on sale of land     $ 3,535            
Deferred revenue     10,142   $ 10,142     $ 10,142 9,526
Cash paid for building         5,322 $ 8,393      
Value of real estate assets reclassified as held for sale         1,713        
Value of real estate assets reclassified out of held for sale due to sale         1,994        
Real estate assets held for sale                  
Real Estate Assets                  
Land     1,283   1,283     1,283 264
Land improvements     679   679     679  
Development costs     1,074   1,074     1,074 2,728
Real estate assets, gross     3,036   3,036     3,036 2,992
Accumulated depreciation     (325)   (325)     (325)  
Real estate assets, net     2,711   2,711     2,711 $ 2,992
Subsequent events                  
Sales                  
Area Of Building | ft² 277,000                
Cash paid for building $ 18,600                
Windsor undeveloped land sale                  
Sales                  
Number of acres sold | a   67         90    
Cash received on sale of land   $ 10,250         $ 8,968    
Number of acres | a   268              
Proceeds from land sale deposited in escrow   $ 9,711              
Revenue from property sales     104   104     8,968  
Pretax gain on land sale   $ 7,975 $ 66   $ 66     $ 6,674  
Land improvements | Minimum                  
Real Estate Assets                  
Estimated Useful Lives         10 years        
Land improvements | Maximum                  
Real Estate Assets                  
Estimated Useful Lives         30 years        
Buildings and improvements | Minimum                  
Real Estate Assets                  
Estimated Useful Lives         10 years        
Buildings and improvements | Maximum                  
Real Estate Assets                  
Estimated Useful Lives         40 years        
Machinery and equipment. | Minimum                  
Real Estate Assets                  
Estimated Useful Lives         3 years        
Machinery and equipment. | Maximum                  
Real Estate Assets                  
Estimated Useful Lives         20 years