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INVESTMENTS: Investments (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
May 31, 2015
May 31, 2016
May 31, 2015
Nov. 30, 2015
Other Income (Expense), net [Member]        
Gain (Loss) on Trading Securities [Abstract]        
Gain (loss) on trading investments $ (9)   $ 50  
Minimum [Member]        
Schedule of Investments [Line Items]        
Held-to-maturity securities, maturity period   3 months    
Maximum [Member]        
Schedule of Investments [Line Items]        
Held-to-maturity securities, maturity period   1 year    
Short-term Investments [Member]        
Schedule of Investments [Line Items]        
Held-to-maturity securities, cost basis   $ 7,370   $ 5,546
Held-to-maturity securities, unrealized gains   0   0
Held-to-maturity securities, carrying value   7,370   5,546
Other Long-term Investments [Member] | Other Assets [Member]        
Schedule of Investments [Line Items]        
Available-for-sale securities, cost basis   947   837
Available-for-sale securities, unrealized gains   967   1,073
Available-for-sale securities, carrying value   1,914   1,910
Cost method investments, cost basis   4,531   4,555
Cost method investments, unrealized gains   0   0
Cost method investments, carrying value   $ 4,531   $ 4,555