Annual report pursuant to Section 13 and 15(d)

Mineral Properties (Details Textual)

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Mineral Properties (Details Textual) (USD $)
1 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2013
Apr. 30, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Asset Retirement Obligation [Member]
Dec. 31, 2013
Pathfinder Mines Corporation [Member]
Apr. 30, 2013
Lost Creek Property [Member]
Dec. 31, 2013
Lost Creek Property [Member]
Jun. 30, 2013
Other Us Properties [Member]
Dec. 31, 2013
Other Us Properties [Member]
Dec. 31, 2013
Nfu Wyoming Llc [Member]
Lost Creek Property [Member]
Percentage of asset acquired                       100.00%
Purchased property interest                       $ 20,000,000
Write-off of mineral properties     1,430,000 0 0       0 261,000 1,430,000  
Payments to Acquire Businesses, Gross             6,700,000          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities           5,700,000            
Royalty On Future Production Percentage               1.67%        
Number Of Mining Claims               20        
Stock Issued During Period Value Issued For Royalty Interest   $ 763,000 $ 763,000         $ 763,000        
Percentage Of Production Royalty On Acquisition 5.00%