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Supplemental Financial Statement Information - Cash flow, etc. (Details)
$ in Thousands
12 Months Ended
Nov. 30, 2019
USD ($)
shares
Nov. 30, 2018
USD ($)
shares
Nov. 30, 2017
USD ($)
a
Feb. 10, 2020
USD ($)
Supplemental Cash Flow Information        
Proceeds from Sale of Land Held-for-investment     $ 3,535  
Number of Acres Sold | a     29  
Increase (decrease) in accounts payable and accrued liabilities related to additions to real estate assets $ 1,017 $ (1,062)    
Increase (decrease) in value of available-for-sale securities: Investment in Centaur Media Plc     $ 245  
Interest paid        
Interest payments 6,402 6,041 5,368  
Interest capitalized included in interest payments $ 351 352 103  
401(k) Savings Plan        
Employer matching contribution, as a percentage of employee contribution 60.00%      
Employer matching contribution as a percentage of base salary 5.00%      
Contributions to the Griffin Savings Plan $ 68 65 65  
Deferred Compensation Plan        
Liability under Deferred Compensation Plan 5,593 5,145   $ 1,900
Expense for employer matching benefit to the Deferred Compensation Plan $ 3 $ 12 $ 11  
2009 Stock Option Plan        
Supplemental Cash Flow Information        
Treasury shares | shares 22,390 30,039    
Treasury stock $ 846 $ 1,189