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Formation of Joint Venture Company (Details) (USD $)	Jan. 08, 2015
Formation of Joint Venture Company [Abstract]
joint adventure investment	$ 45,700,000ctgo_Jointadventureinvestment
Royal Gold percentage of interest	0.00%ctgo_RoyalGoldpercentageofinterest
Royal Gold initial investment	5,000,000ctgo_RoyalGoldinitialinvestment
joint adventure economic interest	40.00%ctgo_Jointadventureeconomicinterest
Royal Gold aggregate amount of investment	30,000,000ctgo_RoyalGoldaggregateamountofinvestment
joint adventure interest retained in the Company	60.00%ctgo_JointadventureinterestretainedintheCompany
Contango Joint Venture Percentage	100.00%ctgo_ContangoJointVenturePercentage
royalgoldadditionalinvestment	$ 750,000ctgo_Royalgoldadditionalinvestment
ADDITIONAL ECONOMIC INTEREST SELLABLE	20.00%ctgo_ADDITIONALECONOMICINTERESTSELLABLE

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Contango Joint Venture Percentage

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joint adventure economic interest

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joint adventure interest retained in the Company

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joint adventure investment; total contributed assets value

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royal gold additional investment which was utilized to partially reimburse the Company for costs and expenses incurred

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Royal Gold aggregate amount of investment

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Royal Gold initial investment

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Royal Gold percentage of interest

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