v3.3.1.900
INVESTMENTS: (Details) - USD ($)
$ in Thousands
12 Months Ended
Nov. 30, 2015
Nov. 30, 2014
Nov. 30, 2013
Net Realized and Unrealized Gain (Loss) on Trading Securities [Abstract]      
Gains on trading investments $ 50 $ 397 $ 1,868
Short-term Investments [Member]      
Gain (Loss) on Investments [Line Items]      
Trading securities, cost basis 0 1,614  
Trading securities, unrealized gains 0 373  
Trading securities, carrying value 0 1,987  
Held-to-maturity securities, cost basis 5,546 5,141  
Held-to-maturity securities, unrealized gains 0 0  
Held-to-maturity securities, carrying value 5,546 5,141  
Short-term investments, cost basis 5,546 6,755  
Short-term investments, unrealized gains 0 373  
Short-term investment, carrying value 5,546 7,128  
Other Long-term Investments [Member] | Other Assets [Member]      
Gain (Loss) on Investments [Line Items]      
Available-for-sale securities, cost basis 837 843  
Available-for-sale securities, unrealized gains 1,073 897  
Available-for-sale securities, carrying value 1,910 1,740  
Cost-method investments, cost basis 4,555 4,578  
Cost-method investments, unrealized gains 0 0  
Cost-method investments, carrying value $ 4,555 $ 4,578