Summary of Significant Accounting Policies (Details Textual) (USD $)	3 Months Ended				6 Months Ended	9 Months Ended	12 Months Ended							12 Months Ended												3 Months Ended	12 Months Ended
	Dec. 31, 2012 Subsidiaries	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2011	Jun. 30, 2012	Sep. 30, 2012	Dec. 31, 2012 Subsidiaries	Dec. 31, 2012 Subsidiaries	Dec. 31, 2011	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2012 Stock options [Member]	Dec. 31, 2011 Stock options [Member]	Dec. 31, 2012 Restricted stock [Member]	Dec. 31, 2010 Oil And Natural Gas Properties [Member]	Dec. 31, 2012 Machinery and Equipment [Member]	Dec. 31, 2012 Maximum [Member]	Dec. 31, 2010 Maximum [Member]	Dec. 31, 2009 Maximum [Member]	Dec. 31, 2012 Minimum [Member]	Dec. 31, 2010 Minimum [Member]	Dec. 31, 2009 Minimum [Member]	Dec. 31, 2012 Class A [Member]	Mar. 31, 2012 Class B [Member]	Dec. 31, 2011 Class B [Member]	Dec. 31, 2012 Class B [Member] Maximum [Member]	Dec. 31, 2012 Class B [Member] Minimum [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Short-term investments with an original maturity																			1 year			30 days
Accounts receivable due period																			60 days			30 days
Useful life																			10 years	5 years	4 years	5 years	3 years	2 years
Useful life using the straight-line																		30 years
Cumulative annual dividends per share rate																											$ 0.26	$ 0.66	$ 0.26
Dividends paid								$ 96,000		$ 275,000		$ 275,000													$ 0
Initial Public Offering																									1,030,700
Restricted stock							162,368	162,368	0	0
Total Dividend paid																										96,356
Interest expense								(1,002,000)		(683,000)		(3,000)					(3,235,000)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total options to purchase shares of the Company's common stock and restricted stock excluded from the calculations														1,067,069	1,024,500	305,807
Vested Period							4 years	4 years						3 years					4 years			3 years
Summary of Significant Accounting Policies (Additional Textual) [Abstract]
Number of wholly owned subsidiaries	4						4	4
Liquid investments with an original maturity							30 days or less	30 days or less
Cash equivalents	2,095,000						2,095,000	2,095,000	10,284,000	10,284,000	21,060,000	21,060,000	104,230,000
Wrote off receivables								0		24,229		0
Capitalized general and administrative costs								2,600,000		2,000,000		1,600,000
Capitalized interest expense								1,600,000		1,300,000		0
Present value discounted percent of future net revenues of proved oil and natural gas reserves									10.00%	10.00%
Average oil and natural gas prices							91.21	2.757	92.71	4.118	75.96	4.376
Net capitalized costs less related deferred income taxes exceeded the full-cost ceiling	17,300,000	2,300,000	21,300,000	23,000,000	21,300,000	2,300,000		17,300,000
Impairment charge of net capitalized costs				35,700,000	33,200,000	3,600,000		63,475,000		35,673,000		0
Deferred income tax credit				12,700,000	11,900,000	1,300,000		3,618,000,000		(24,375,000)		(9,156,000)
Stock-based compensation (non-cash) expense								100,000		2,400,000		900,000
Common stock and restricted stock unit expense								100,000		200,000		200,000
Percentage being realized up on ultimate settlement							50.00%	50.00%
Interest or penalties expense								0		0		0
Dividends declared								27,643		274,853		274,853
Working interest percentage							25.00%	25.00%
Billing date	30 days						30 days	30 days
Outstanding days of account receivable							60 days	60 days
Stock-based compensation	0						0	0
Granted stock Option								$ (589,000)		$ 2,362,000		$ 824,000