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