Annual report pursuant to Section 13 and 15(d)

Segment Information (Details Textual)

v2.4.0.6
Segment Information (Details Textual)
12 Months Ended
Dec. 31, 2012
Mercuria [Member]
Dec. 31, 2011
Mercuria [Member]
Dec. 31, 2010
Vitol [Member]
Revenue, Major Customer [Line Items]      
Sale of oil under Contract to Mercuria 99.00% 99.00% 100.00%