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Stock Based Compensation Narrative (Details) (USD $)
1 Months Ended 3 Months Ended 9 Months Ended 24 Months Ended 1 Months Ended
Nov. 30, 2014
Dec. 31, 2012
Jul. 31, 2012
Sep. 30, 2011
Mar. 31, 2015
Mar. 31, 2014
Jun. 30, 2013
Mar. 31, 2015
Mar. 31, 2014
Jan. 08, 2017
Nov. 30, 2010
Jul. 31, 2013
Jan. 08, 2015
Dec. 08, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Nonvested balance (in shares)         18,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber     18,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber            
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price   $ 10.20us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice $ 10.25us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice $ 13.13us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice $ 10.01us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice   $ 10.00us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice              
Restricted shares granted during period 27,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod                          
restricted stock issued shares DIRECTORS                         30,000ctgo_RestrictedstockissuedsharesDIRECTORS  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Exercisable Options                         10,000us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions  
remaining shares to be vested                   two-thirds        
restricted stock issued shares                         10,000ctgo_Restrictedstockissuedshares  
restricted stock issued shares DIRECTORS unvested         20,000ctgo_RestrictedstockissuedsharesDIRECTORSunvested     20,000ctgo_RestrictedstockissuedsharesDIRECTORSunvested            
Stock-based compensation expense         $ 127,025ctgo_ShareBasedCompensationExpense $ 122,951ctgo_ShareBasedCompensationExpense   $ 399,068ctgo_ShareBasedCompensationExpense $ 689,747ctgo_ShareBasedCompensationExpense          
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options         10,348us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions     10,348us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions            
Restricted Stock [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Nonvested balance (in shares)         59,666us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
    59,666us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
           
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Share-based Awards Other than Options         $ 311,710us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
    $ 311,710us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
           
2010 Plan [Member] | Equity Option [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Options outstanding           1,692,666us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_PlanNameAxis
= ctgo_A2010PlanMember
    1,692,666us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_PlanNameAxis
= ctgo_A2010PlanMember
         
2010 Plan [Member] | Stock Compensation Plan [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Common stock and options authorized under plan                           1,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= us-gaap_StockCompensationPlanMember
/ us-gaap_PlanNameAxis
= ctgo_A2010PlanMember
2010 Plan [Member] | Restricted Stock [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Restricted shares granted during period           95,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= ctgo_A2010PlanMember
               
2010 Plan [Member] | Stock Options [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term         3 years                  
Options outstanding         445,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= ctgo_A2010PlanMember
    445,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= ctgo_A2010PlanMember
           
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price         $ 0.00us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= ctgo_A2010PlanMember
                 
Weighted-average exercise price (USD per share)               $ 0.00us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= ctgo_A2010PlanMember
           
Directors and Officers [Member] | 2010 Plan [Member] | Restricted Stock [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Restricted shares granted during period                     70,429us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= ctgo_A2010PlanMember
/ us-gaap_TitleOfIndividualAxis
= ctgo_DirectorsAndOfficersMember
     
Owner of Avalon Development Corporation [Member] | 2010 Plan [Member] | Restricted Stock [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Restricted shares granted during period                     23,477us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= ctgo_A2010PlanMember
/ us-gaap_TitleOfIndividualAxis
= ctgo_OwnerOfAvalonDevelopmentCorporationMember
     
technical consultant [Member] | 2010 Plan [Member] | Equity Option [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price                       $ 10.00us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_PlanNameAxis
= ctgo_A2010PlanMember
/ us-gaap_TitleOfIndividualAxis
= ctgo_TechnicalConsultantMember