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Marketable Securities, Eldorado Resorts, Inc. (Details) - USD ($)
3 Months Ended 5 Months Ended
Sep. 19, 2014
May. 31, 2015
Feb. 28, 2015
May. 31, 2014
Dec. 31, 2007
Schedule of Equity Method Investments [Line Items]          
Change in net unrealized holding gain (loss) $ (7,100,000) $ 16,200,000 $ 1,900,000    
Investment         $ 38,000,000
Eldorado          
Schedule of Equity Method Investments [Line Items]          
Equity method investee percentage ownership in JV (percent)   17.0359%      
Investment   $ 32,888,389 18,540,023    
Mesquite          
Schedule of Equity Method Investments [Line Items]          
Common stock issued (shares) 4,040,440     4,030,440  
Par value (usd per share) $ 0.00001 $ 0.00001      
Equity method investee percentage ownership in JV (percent) 8.60% 8.60%      
Investment   $ 5,639,222 $ 4,282,422