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Income Taxes - Income Tax Net Deferred Tax Assets and Liabilities (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Deferred tax assets:    
Loss carryovers $ 10,118 $ 9,887
Deferred Gain 1,253   
Stock option compensation expense 900 648
Royalty 1,492 1,492
Earnings in Unconsolidated Subsidiary 496 314
Severance 30 30
Unrealized loss on derivative securities 79   
Other 106 67
Valuation allowance (10,328) (9,699)
Total deferred tax assets 4,146 2,739
Deferred tax liabilities:    
Unrealized gain on derivative securities    107
MH-LLC investment 1,932 1,083
Exploration costs 845 845
Unrealized gains on marketable equity securities 2,328 3,496
Other 4  
Total deferred tax liabilities 5,109 5,536
Net deferred tax liabilities $ 963 $ 2,797