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Other Assets (Details) (USD $)	1 Months Ended		13 Months Ended
Other Assets (Details) (USD $)	Jul. 31, 2011	Jun. 30, 2011	Jun. 30, 2012	Mar. 31, 2015	May 31, 2011
Royalties [Line Items]
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
Tetlin Lease [Member]
Royalties [Line Items]
Payment to Tetlin to reduce royalty rate			225,000
Decrease in royalty rates				0.75%
Tetlin Lease [Member] \| Minimum [Member]
Royalties [Line Items]
Royalty rate	1.25%				2.00%
Tetlin Lease [Member] \| Maximum [Member]
Royalties [Line Items]
Royalty rate	4.25%				5.00%
Tetlin Lease [Member] \| Scenario 1 [Member]
Royalties [Line Items]
Increase in royalty rates				0.25%
Payment by Tetlin to increase royalty rate				150,000
Tetlin Lease [Member] \| Scenario 2 [Member]
Royalties [Line Items]
Increase in royalty rates				0.50%
Payment by Tetlin to increase royalty rate				300,000
Tetlin Lease [Member] \| Scenario 3 [Member]
Royalties [Line Items]
Increase in royalty rates				0.75%
Payment by Tetlin to increase royalty rate				450,000