Related Party Transactions (Narrative) (Details)	1 Months Ended			12 Months Ended
	Feb. 28, 2015 USD ($) a	Apr. 30, 2012 USD ($) a	Oct. 31, 2011 USD ($) a	Dec. 31, 2015 USD ($)	Dec. 31, 2012 USD ($) $ / bbl	Dec. 31, 2014 USD ($)	Dec. 31, 2011
Related Party Transaction [Line Items]
Due from Employees				$ 34,000		$ 161,000
Joint Venture Agreement [Member]
Related Party Transaction [Line Items]
Percentage of ownership in joint venture							80.00%
Funded amount for joint venture				$ 2,400,000		$ 4,500,000
Percentage of ownership in subsidiary				100.00%
Darle Vuelta Cattle Co Llc
Related Party Transaction [Line Items]
Acquisition of land, area, in acres | a	100	22	17
Payment to acquire land	$ 1,500,000	$ 215,000	$ 209,000
Darle Vuelta Cattle Co Llc | Salt Water Disposal Well
Related Party Transaction [Line Items]
Term of lease agreement				2 years
Price of oil and gas waste per barrel | $ / bbl					0.10
Price of brine or fresh water per barrel | $ / bbl					0.05
Monthly payment on leases					$ 5,000