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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     30,000,000us-gaap_CommonStockSharesAuthorized 30,000,000us-gaap_CommonStockSharesAuthorized  
Preferred stock, shares authorized     15,000,000us-gaap_PreferredStockSharesAuthorized    
Common stock, shares outstanding     3,876,206us-gaap_CommonStockSharesOutstanding 3,805,539us-gaap_CommonStockSharesOutstanding  
Common Stock, Shares, Issued     3,876,206us-gaap_CommonStockSharesIssued 3,805,539us-gaap_CommonStockSharesIssued  
Nonvested balance (in shares)     18,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber    
Options and warrants outstanding     1,675,999ctgo_OptionsAndWarrantsOutstanding    
Distribution [Abstract]          
Subsidiary shares issued 1,600,000us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction        
Number of shares preferential right will allow holder to purchase   1/100      
Common stock, par value     $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare  
Percentage of Preferred Stock Holder Can Under the Rights Plan     1,675,999.00us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights   0.01us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
Class of Warrant or Right, Exercise Price of Warrants or Rights         $ 80us-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 3.5ctgo_ParentContribution
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ctgo_ContangoMember
       
Restricted Stock [Member]          
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]          
Nonvested balance (in shares)     59,666us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember