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Oil and Gas Exploration and Production Industries Disclosures (Details 5) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Future cash inflows	$ 51,004,000	$ 58,216,000	$ 41,973,000
Future development and production costs	25,941,000	24,445,000	19,454,000
Future abandonment costs	1,328,000	1,279,000	1,235,000
Future income tax expense	5,238,000	7,987,000	4,759,000
Future net cash flow	18,497,000	24,505,000	16,525,000
10% annual discount	7,771,000	9,392,000	6,368,000
Standardized measure of discounted future net cash flow	$ 10,726,000	$ 15,113,000	$ 10,157,000

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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- Definition

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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- Definition

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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