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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

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