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Other Assets (Details) (USD $)
 1 Months Ended 13 Months Ended
Jul. 31, 2011
Jun. 30, 2011
Mar. 31, 2013
Jun. 30, 2012
Tetlin Lease [Member]
Mar. 31, 2013
Tetlin Lease [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]
Royalties [Line Items]                        
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