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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 | Mar. 31, 2013 | Jun. 30, 2012 Tetlin Lease [Member] | Mar. 31, 2013 Tetlin Lease [Member] | Jul. 15, 2012 Tetlin Lease [Member] Minimum [Member] | Jun. 30, 2012 Tetlin Lease [Member] Minimum [Member] | May 31, 2011 Tetlin Lease [Member] Minimum [Member] | Jun. 30, 2012 Tetlin Lease [Member] Maximum [Member] | May 31, 2011 Tetlin Lease [Member] Maximum [Member] | Mar. 31, 2013 Tetlin Lease [Member] Scenario 1 [Member] | Mar. 31, 2013 Tetlin Lease [Member] Scenario 2 [Member] | Mar. 31, 2013 Tetlin Lease [Member] Scenario 3 [Member] | Mar. 31, 2013 JEX [Member] | Nov. 29, 2010 Native Village of Tetlin Land [Member] acre | Mar. 31, 2013 ALASKA JEX [Member]
Royalties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of Acreage Available for Renewal |  |  | 50.00% | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Leasehold Interest Acreage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 675,000 |
Payment by Lessee to Remove Acreage Renewal Restriction |  |  | $ 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contractual annual exploration costs |  |  |  |  | 350,000 |  |  |  |  |  |  |  |  |  |  |  |
Royalty rate |  |  |  |  |  |  |  | 1.25% | 2.00% | 4.25% | 5.00% |  |  |  |  |  |
Payment to Tetlin to reduce royalty rate | 150,000 | 75,000 |  |  | 225,000 |  |  |  |  |  |  |  |  |  |  |  |
Decrease in royalty rates | 0.50% |  |  | 0.25% |  | 0.75% |  |  |  |  |  |  |  |  |  |  |
Increase in royalty rates |  |  |  |  |  |  |  |  |  |  |  | 0.25% | 0.50% | 0.75% |  |  |
Payment by Tetlin to increase royalty rate |  |  |  |  |  |  |  |  |  |  |  | 150,000 | 300,000 | 450,000 |  |  |
Advance royalties |  |  |  |  |  |  | $ 75,000 | $ 50,000 |  |  |  |  |  |  |  |  |
Overriding royalty interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.00% |  | 2.00%

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