Joint Venture (Details) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012	Aug. 18, 2010 acre
Schedule of Equity Method Investments [Line Items]
Land contributed to Blue Eagle Energy, LLC (in acres)				8,333
Payment to acquire interest in joint venture			$ 25,000,000
Gain from equity method investments	0	783,000
Blue Eagle [Member]
Schedule of Equity Method Investments [Line Items]
Equity interest in joint venture				25,000,000
Gain from equity method investments		783,000
Statement of Operations:
Revenue		3,821,000
Operating expenses		2,128,000
Other (income) expense		(1,000)
Net income:		1,694,000
Blue Eagle [Member] | Rock Oil [Member]
Schedule of Equity Method Investments [Line Items]
Equity interest in joint venture				25,000,000