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Standardized Measure of Discounted Future Net Cash Flows (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]
Future production revenue	$ 246,535,000	$ 242,383,840
Future production costs	(69,131,000)	(93,373,850)
Future development costs	(11,766,000)	(12,767,540)
Future cash flows before income tax	165,638,000	136,242,450
Future income taxes	(33,550,000)	(22,864,737)
Future net cash flows	132,088,000	113,377,713
10% annual discount for estimating of future cash flows	(83,215,000)	(69,730,808)
Standardized measure of discounted net cash flows	$ 48,873,000	$ 43,646,905

X

- Definition

The future cost of producing oil and gas from proved reserves located in this geographic region.

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This is the amount that is derived from using a discount rate of ten percent a year to reflect the timing of the future net cash flows relating to proved oil and gas reserves.

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Cash proceeds expected from future sale of oil and gas from proved reserves located in this geographic region.

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The future cost of developing oil and gas from proved reserves located in this geographic region.

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The estimated future income tax expenses that will be incurred based on the future income less future expenses derived from production and sale of proved oil and gas reserves in this geographic region.

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These amounts are the result of subtracting future development and production costs and future income tax expenses from future cash inflows for each geographic region where proved oil and gas reserves exist.

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This amount is the future net cash flows less the computed discount.

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