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Shareholders' Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified | 0 Months Ended | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Nov. 29, 2010 | Mar. 31, 2014 | Mar. 31, 2015 | Jun. 30, 2014 | Dec. 19, 2012
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |
Common stock, shares authorized |  |  | 30,000,000 us-gaap_CommonStockSharesAuthorized | 30,000,000 us-gaap_CommonStockSharesAuthorized |
Preferred stock, shares authorized |  |  | 15,000,000 us-gaap_PreferredStockSharesAuthorized |  |
Common stock, shares outstanding |  |  | 3,876,206 us-gaap_CommonStockSharesOutstanding | 3,805,539 us-gaap_CommonStockSharesOutstanding |
Common Stock, Shares, Issued |  |  | 3,876,206 us-gaap_CommonStockSharesIssued | 3,805,539 us-gaap_CommonStockSharesIssued |
Nonvested balance (in shares) |  |  | 18,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber |  |
Options and warrants outstanding |  |  | 1,675,999 ctgo_OptionsAndWarrantsOutstanding |  |
Distribution [Abstract] |  |  |  |  |
Subsidiary shares issued | 1,600,000 us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction |  |  |  |
Number of shares preferential right will allow holder to purchase |  | 1/100 |  |  |
Common stock, par value |  |  | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare |
Percentage of Preferred Stock Holder Can Under the Rights Plan |  |  | 1,675,999.00 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights |  | 0.01 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  |  |  | $ 80 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Maximum Percentage ownership by persons other than Ken Peak's estate before rights are exercisable |  |  |  |  | 20.00%ctgo_MaximumPercentageownershipbypersonsotherthanKenPeaksestatebeforerightsareexercisable
Rate of Rights Distribution |  |  |  |  | 100.00%ctgo_RateOfRightsDistribution
Contango [Member] |  |  |  |  |
Distribution [Abstract] |  |  |  |  |
Parent contribution | 3.5 ctgo_ParentContribution / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = ctgo_ContangoMember |  |  |  |
Restricted Stock [Member] |  |  |  |  |
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |
Nonvested balance (in shares) |  |  | 59,666 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |

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