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Investment in Peak Gold, LLC (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended 21 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Sep. 30, 2016
Jan. 08, 2015
Jun. 30, 2014
Schedule of Equity Method Investments [Line Items]                
Exploration expense of equity method investment $ 3,012,330 $ 2,960,055       $ 12,544,189    
General and Administrative Expense of Equity Method Investment 440,363 354,254       2,242,762    
Total Expenses of Equity Method Investment 3,452,693 3,314,309       14,786,951    
Equity Method Investment, Summarized Financial Information, Current Assets 789,203     $ 990,698   789,203    
Equity Method Investment, Summarized Financial Information, Noncurrent Assets 1,433,886     1,433,886   1,433,886    
Suspended Losses 12,400,000              
Income (Loss) from Equity Method Investments 0 0 $ 5,600,000 0 $ (1,433,886) 13,800,000    
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures 0     0   0 $ 1,433,886  
Investment by Joint Venture Partner $ 2,700,000         $ 13,400,000    
Royal Alaska Joint Venture Percentage 15.10%         15.10%    
Contango Joint Venture Percentage 0.00%         0.00% 100.00%  
Equity Method Investments $ 0.0     0 $ 0 $ 0.0   $ 0
Equity Method Investment, Summarized Financial Information, Assets 2,223,089     2,424,584   2,223,089    
Equity Method Investment, Summarized Financial Information, Current Liabilities 2,226,154     1,674,956   2,226,154    
Equity Method Investment, Summarized Financial Information, Liabilities       1,674,956        
Equity Method Investment Summarized Financial Information, Equity (3,065)     749,628   (3,065)    
Equity Method Investment, Summarized Financial Information, Liabilities and Equity 2,223,089     $ 2,424,584   2,223,089    
Equity Method Investment, Summarized Financial Information, Net Income (Loss) $ 3,452,693 $ 3,314,309       $ 14,786,951    
Contango's percentage of interest in Joint Venture Company 85.00% 100.00% 100.00%     85.00%    
Contango Ore Inc [Member]                
Schedule of Equity Method Investments [Line Items]                
Equity Method Investment, Summarized Financial Information, Net Income (Loss) $ 2,900,000 $ 3,300,000