Annual report pursuant to section 13 and 15(d)

NOTE 10. SUPPLEMENTAL INFORMATION RELATING TO OIL AND GAS PRODUCING ACTIVITIES (UNAUDITED) (Detail) - Standardized Measure of Discounted Future Cash Flows Relating to Proved Reserves (Parentheticals)

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NOTE 10. SUPPLEMENTAL INFORMATION RELATING TO OIL AND GAS PRODUCING ACTIVITIES (UNAUDITED) (Detail) - Standardized Measure of Discounted Future Cash Flows Relating to Proved Reserves (Parentheticals)
12 Months Ended
Dec. 31, 2012
Discount rate 10.00%