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Supplemental Financial Statement Information - AFS Securities (Details) - USD ($)
$ in Thousands
Jun. 09, 2017
May 31, 2017
Feb. 28, 2017
Nov. 30, 2016
Feb. 29, 2016
Available for Sale Securities          
Shares of common stock held in Centaur Media   1,952,462      
Shares of Centaur Media common stock sold     0   0
Investment in Centaur Media          
Fair value   $ 1,272   $ 977  
Cost   1,014   1,014  
Unrealized (loss)       $ (37)  
Unrealized gain   $ 258      
Subsequent events          
Available for Sale Securities          
Shares of Centaur Media common stock sold 1,800,823        
Proceeds from sale of shares $ 1,120        
Gain on sale of common stock in Centaur Media plc $ 234