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Note 13. Asset Retirement Obligations (Tables) | 9 Months Ended
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Sep. 30, 2012
Schedule of Asset Retirement Obligations [Table Text Block] |
|  | 2012 |  |  | 2011 |
Balance, January 1 |  | $ | 37,643 |  |  | $ | 36,397 |
Changes in obligations due to changes in reclamation plans |  |  | — |  |  |  | 387 |
Accretion expense |  |  | 842 |  |  |  | 1,119 |
Payment of reclamation obligations |  |  | (266 | ) |  |  | (260 | )
Balance, end of period |  | $ | 38,219 |  |  | $ | 37,643 |

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- Definition Tabular disclosure of the carrying amount of a liability for asset retirement obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
Name: | us-gaap_ScheduleOfAssetRetirementObligationsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration