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Summary of Significant Accounting Policies (Details) (USD $) In Millions, except Share data, unless otherwise specified	Mar. 31, 2015	Jan. 08, 2015	Jun. 30, 2014
Jointly Owned Utility Plant Interests [Line Items]
Royal Gold initial investment		$ 5ctgo_RoyalGoldinitialinvestment
Contango's percentage of interest in Joint Venture Company	100.00%ctgo_ContangospercentageofinterestinJointVentureCompany
Common stock, shares authorized	30,000,000us-gaap_CommonStockSharesAuthorized		30,000,000us-gaap_CommonStockSharesAuthorized
Common stock, par value	$ 0.01us-gaap_CommonStockParOrStatedValuePerShare		$ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares issued	3,876,206us-gaap_CommonStockSharesIssued		3,805,539us-gaap_CommonStockSharesIssued
Common stock, shares outstanding	3,876,206us-gaap_CommonStockSharesOutstanding		3,805,539us-gaap_CommonStockSharesOutstanding

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Contango's percentage of interest in Joint Venture Company

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Royal Gold initial investment

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Face amount or stated value per share of common stock.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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