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Commitments and Contingencies Royalties (Details) (USD $)
1 Months Ended 3 Months Ended 13 Months Ended
Jul. 31, 2011
Jun. 30, 2011
Dec. 31, 2012
Jun. 30, 2012
Mar. 31, 2015
Mar. 31, 2014
Jul. 15, 2012
May 31, 2011
Nov. 29, 2010
acre
Sep. 29, 2014
Royalties [Line Items]                    
Percentage of Acreage Available for Renewal         50.00%ctgo_PercentageOfAcreageAvailableForRenewal 50.00%ctgo_PercentageOfAcreageAvailableForRenewal        
Payment by Lessee to Remove Acreage Renewal Restriction     $ 200,000ctgo_PaymentByLesseeToRemoveAcreageRenewalRestriction              
Payment to Tetlin to reduce royalty rate 150,000ctgo_PaymentByLeasorToReduceRoyaltyRate 75,000ctgo_PaymentByLeasorToReduceRoyaltyRate                
Decrease in royalty rates 0.50%ctgo_DecreaseInRoyaltyRates 0.25%ctgo_DecreaseInRoyaltyRates                
Deposit On Advance Minimum Royalty         40,000ctgo_DepositOnAdvanceMinimumRoyalty          
Advance Minimum Royalty         75,000ctgo_AdvanceMinimumRoyalty          
Tetlin Lease [Member]                    
Royalties [Line Items]                    
Contractual annual exploration costs         350,000ctgo_ContractualAnnualExplorationCosts
/ us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis
= ctgo_TetlinLeaseMember
         
Payment to Tetlin to reduce royalty rate       225,000ctgo_PaymentByLeasorToReduceRoyaltyRate
/ us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis
= ctgo_TetlinLeaseMember
           
Decrease in royalty rates         0.75%ctgo_DecreaseInRoyaltyRates
/ us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis
= ctgo_TetlinLeaseMember
         
Tetlin Lease [Member] | Minimum [Member]                    
Royalties [Line Items]                    
Royalty rate 1.25%ctgo_RoyaltyRate
/ us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis
= ctgo_TetlinLeaseMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
            2.00%ctgo_RoyaltyRate
/ us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis
= ctgo_TetlinLeaseMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Advance royalties         50,000ctgo_OilAndGasAdvanceRoyalties
/ us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis
= ctgo_TetlinLeaseMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
  75,000ctgo_OilAndGasAdvanceRoyalties
/ us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis
= ctgo_TetlinLeaseMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
     
Tetlin Lease [Member] | Maximum [Member]                    
Royalties [Line Items]                    
Royalty rate 4.25%ctgo_RoyaltyRate
/ us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis
= ctgo_TetlinLeaseMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
            5.00%ctgo_RoyaltyRate
/ us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis
= ctgo_TetlinLeaseMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Tetlin Lease [Member] | Scenario 1 [Member]                    
Royalties [Line Items]                    
Increase in royalty rates         0.25%ctgo_IncreaseInRoyaltyRates
/ us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis
= ctgo_TetlinLeaseMember
/ us-gaap_StatementScenarioAxis
= ctgo_Scenario1Member
         
Payment by Tetlin to increase royalty rate         150,000ctgo_PaymentByLeaseeToIncreaseRoyaltyRate
/ us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis
= ctgo_TetlinLeaseMember
/ us-gaap_StatementScenarioAxis
= ctgo_Scenario1Member
         
Tetlin Lease [Member] | Scenario 2 [Member]                    
Royalties [Line Items]                    
Increase in royalty rates         0.50%ctgo_IncreaseInRoyaltyRates
/ us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis
= ctgo_TetlinLeaseMember
/ us-gaap_StatementScenarioAxis
= ctgo_Scenario2Member
         
Payment by Tetlin to increase royalty rate         300,000ctgo_PaymentByLeaseeToIncreaseRoyaltyRate
/ us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis
= ctgo_TetlinLeaseMember
/ us-gaap_StatementScenarioAxis
= ctgo_Scenario2Member
         
Tetlin Lease [Member] | Scenario 3 [Member]                    
Royalties [Line Items]                    
Increase in royalty rates         0.75%ctgo_IncreaseInRoyaltyRates
/ us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis
= ctgo_TetlinLeaseMember
/ us-gaap_StatementScenarioAxis
= ctgo_Scenario3Member
         
Payment by Tetlin to increase royalty rate         $ 450,000ctgo_PaymentByLeaseeToIncreaseRoyaltyRate
/ us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis
= ctgo_TetlinLeaseMember
/ us-gaap_StatementScenarioAxis
= ctgo_Scenario3Member
         
JEX [Member]                    
Royalties [Line Items]                    
Overriding royalty interest         3.00%ctgo_OverridingRoyaltyInterest
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ctgo_JexMember
         
Native Village of Tetlin Land [Member]                    
Royalties [Line Items]                    
Leasehold Interest Acreage                 675,000ctgo_LeaseholdInterestAcreage
/ us-gaap_StatementGeographicalAxis
= ctgo_NativeVillageOfTetlinLandMember
 
ALASKA | JEX [Member]                    
Royalties [Line Items]                    
Overriding royalty interest         2.00%ctgo_OverridingRoyaltyInterest
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ctgo_JexMember
/ us-gaap_StatementGeographicalAxis
= stpr_AK
        2.00%ctgo_OverridingRoyaltyInterest
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ctgo_JexMember
/ us-gaap_StatementGeographicalAxis
= stpr_AK