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9. Fair value measurements (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Assets: |  |
Assets | $ 128 | $ 189
Liabilities: |  |
Liabilities | 6,674 | 5,059
Commodity contracts [Member] |  |
Assets: |  |
Assets | 128 | 189
Liabilities: |  |
Liabilities | 44 | 167
Warrants [Member] |  |
Liabilities: |  |
Liabilities | 5,491 | 4,892
Conversion Features [Member] |  |
Liabilities: |  |
Liabilities | 1,139 |
Level 1 [Member] |  |
Assets: |  |
Assets | 128 | 189
Liabilities: |  |
Liabilities | 44 | 167
Level 1 [Member] | Commodity contracts [Member] |  |
Assets: |  |
Assets | 128 | 189
Liabilities: |  |
Liabilities | 44 | 167
Level 1 [Member] | Warrants [Member] |  |
Liabilities: |  |
Liabilities | 0 | 0
Level 1 [Member] | Conversion Features [Member] |  |
Liabilities: |  |
Liabilities | 0 |
Level 2 [Member] |  |
Assets: |  |
Assets | 0 | 0
Liabilities: |  |
Liabilities | 0 | 0
Level 2 [Member] | Commodity contracts [Member] |  |
Assets: |  |
Assets | 0 | 0
Liabilities: |  |
Liabilities | 0 | 0
Level 2 [Member] | Warrants [Member] |  |
Liabilities: |  |
Liabilities | 0 | 0
Level 2 [Member] | Conversion Features [Member] |  |
Liabilities: |  |
Liabilities | 0 |
Level 3 [Member] |  |
Assets: |  |
Assets | 0 | 0
Liabilities: |  |
Liabilities | 6,630 | 4,892
Level 3 [Member] | Commodity contracts [Member] |  |
Assets: |  |
Assets | 0 | 0
Liabilities: |  |
Liabilities | 0 | 0
Level 3 [Member] | Warrants [Member] |  |
Liabilities: |  |
Liabilities | 5,491 | 4,892
Level 3 [Member] | Conversion Features [Member] |  |
Liabilities: |  |
Liabilities | $ 1,139 |

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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