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Commitments and Contingencies Royalties (Details) | 13 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2012 USD ($) | Sep. 30, 2016 USD ($) | Sep. 29, 2014 | Sep. 01, 2012 | Jul. 15, 2012 USD ($) | Jul. 31, 2011 | May 31, 2011 | Nov. 29, 2010 a
Tetlin Lease [Member] |  |  |  |  |  |  |  |
Royalties [Line Items] |  |  |  |  |  |  |  |
Contractual annual exploration costs |  | $ 350,000 |  |  |  |  |  |
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% |
Advance royalties |  | $ 50,000 |  |  | $ 75,000 |  |  |
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 |  |  |  |  |  |
JEX [Member] |  |  |  |  |  |  |  |
Royalties [Line Items] |  |  |  |  |  |  |  |
Overriding royalty interest |  | 3.00% |  |  |  |  |  |
Native Village of Tetlin Land [Member] |  |  |  |  |  |  |  |
Royalties [Line Items] |  |  |  |  |  |  |  |
Leasehold Interest Acreage | a |  |  |  |  |  |  |  | 675,000
ALASKA | JEX [Member] |  |  |  |  |  |  |  |
Royalties [Line Items] |  |  |  |  |  |  |  |
Overriding royalty interest |  |  | 2.00% | 2.00% |  |  |  |

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