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Subsequent Events Subsequent Events details (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 24 Months Ended 46 Months Ended
Jan. 08, 2017
Oct. 31, 2018
Jan. 08, 2015
Subsequent Event [Line Items]      
royalgoldjointventure   $ 30ctgo_Royalgoldjointventure  
Royal Gold initial investment     $ 5ctgo_RoyalGoldinitialinvestment
Contango Joint Venture Percentage     100.00%ctgo_ContangoJointVenturePercentage
joint adventure economic interest     40.00%ctgo_Jointadventureeconomicinterest
ADDITIONAL ECONOMIC INTEREST SELLABLE     20.00%ctgo_ADDITIONALECONOMICINTERESTSELLABLE
Stock Issued During Period, Shares, Restricted Stock Award, Gross     10,000ctgo_Restrictedstockissuedshares
restricted stock issued shares DIRECTORS     30,000ctgo_RestrictedstockissuedsharesDIRECTORS
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Exercisable Options     10,000us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
remaining shares to be vested in two years two-thirds