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Note 11 - Business Segments and Significant Customers (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Noncapital Costs | $ 25,300,000 |  |
Depreciation, Depletion and Amortization | 50,113,000 | 47,348,000 | 60,235,000
Derivative, Loss on Derivative | 1,300,000 |  | 3,000,000
Derivative, Gain on Derivative | 10,500,000 | 7,100,000 |
Lucky Friday [Member] |  |  |
Noncapital Costs | 500,000 |  |
Depreciation, Depletion and Amortization | $ 6,300,000 |  |

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