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Other Assets (Details) - USD ($)
 1 Months Ended 13 Months Ended
Jul. 31, 2011
Jun. 30, 2011
Jun. 30, 2012
Mar. 31, 2016
May. 31, 2011
Royalties [Line Items]          
Payment to Tetlin to reduce royalty rate $ 150,000 $ 75,000      
Decrease in royalty rates 0.50% 0.25%      
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