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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
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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%