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Supplemental Financial Statement Information - Cash flow, etc. (Details) - USD ($)
$ in Thousands
12 Months Ended
Nov. 30, 2020
Nov. 30, 2019
Nov. 30, 2018
Feb. 10, 2020
Supplemental Cash Flow Information        
Decrease in deferred compensation liability $ 1,927      
Noncash deferred compensation expense $ 469 $ 376 $ 23  
Treasury shares 24,893 22,390 30,039  
Treasury stock $ 1,358 $ 846 $ 1,189  
Increase (decrease) in accounts payable and accrued liabilities related to additions to real estate assets 1,410 1,017    
Proceeds from tax refunds 202      
Interest paid        
Interest payments 6,935 6,402 6,041  
Interest capitalized included in interest payments $ 114 351 352  
Retirement Benefits        
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 $ 69 68 65  
Deferred Compensation Plan        
Liability under Deferred Compensation Plan 4,170 5,593   $ 1,927
Expense for employer matching benefit to the Deferred Compensation Plan $ 11 $ 11 $ 12