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Formation of Joint Venture Company (Details) - USD ($)
Mar. 31, 2016
Mar. 31, 2015
Jan. 08, 2015
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures $ 0 $ 1,400,000 $ 1,433,886
Royal Alaska Joint Venture Percentage 6.80%    
joint adventure investment     $ 45,700,000
Royal Gold percentage of interest     0.00%
Royal Gold initial investment     $ 5,000,000
joint adventure economic interest     40.00%
Royal Gold aggregate amount of investment     $ 30,000,000
joint adventure interest retained in the Company     60.00%
Contango Joint Venture Percentage 93.00%   100.00%
royalgoldadditionalinvestment     $ 750,000
ADDITIONAL ECONOMIC INTEREST SELLABLE     20.00%