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Segment Information (Details Textual)
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12 Months Ended | ||
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Dec. 31, 2012
Mercuria [Member]
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Dec. 31, 2011
Mercuria [Member]
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Dec. 31, 2010
Vitol [Member]
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| Revenue, Major Customer [Line Items] | |||
| Sale of oil under Contract to Mercuria | 99.00% | 99.00% | 100.00% |
| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Percentage of revenue generated from a single external customer that accounts for 10 percent or more of an entity's revenues. No definition available.
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