Oil and Gas Reserves (unaudited) (Details 3) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Standardized Measure relating to proved reserves:
Future cash inflows	$ 895,951,200	$ 1,133,153,500	$ 860,655,250
Future production and development costs:
Production	(193,747,800)	(305,301,493)	(218,221,203)
Development	(155,937,800)	(299,390,312)	(195,819,078)
Future cash flows before income taxes	546,265,600	528,461,695	446,614,969
Future income taxes	(80,702,813)	(40,347,466)	(37,624,289)
Future net cash flows after income taxes	465,562,787	488,114,229	408,990,680
10% annual discount for estimated timing of cash flows	(169,123,190)	(232,782,186)	(182,476,004)
Standardized measure of discounted future net cash flows	296,439,597	255,332,043	226,514,676
Reconciles the change in the Standardized Measure:
Beginning of year	255,332,043	226,514,676	176,422,700
Changes from:
Change in prices and in production costs	61,122,312	35,843,018	(1,102,871)
Changes in estimated future development costs	(1,336,336)	(11,283,184)	(11,801,896)
Sales of crude oil, natural gas and natural gas liquids produced, net of production costs	(91,175,504)	(86,132,123)	(53,956,677)
Extensions, discoveries and improved recovery, less related costs	98,539,507	113,088,953	109,361,697
Purchases of minerals in place		226,395
Sales of minerals in place			(408,190)
Revision of quantity estimates	(52,958,824)	(29,416,407)	9,476,255
Previously estimated development costs incurred during the period	22,482,000	75,258,100	11,788,100
Accretion of discount	24,482,116	(70,061,524)	17,642,270
Changes in production rates (timing) and other	12,448,329	(770,619)	(17,700,497)
Change in income taxes	(32,496,046)	2,064,758	(13,206,215)
Total change in the Standardized Measure	41,107,554	28,817,367	50,091,976
End of year	296,439,597	255,332,043	226,514,676
Effects of realized derivative hedging gains excluded from sale	$ 6,965,808	$ 7,497,604	$ 20,912,559