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Disclosures About Capitalized Costs, Costs Incurred (Details 2) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Company      
Revenue      
Oil and gas revenues $ 288 $ 190 $ 2,019
Expenses      
Production costs 29 147 5,283
Depletion and amortization 66 69 42
Exploration 0 0 0
Abandoned and impaired properties 0 0 0
Impairment of unproved properties 0 0 0
Results of operations of oil and gas producing activities 193 (26) (3,306)
Company's Share of Laramie Energy      
Revenue      
Oil and gas revenues 66,783 43,607 14,217
Expenses      
Production costs 32,606 27,750 11,047
Depletion and amortization 21,277 17,534 8,226
Abandoned and impaired properties 0 0 3,977
Impairment of unproved properties 0 0 3,977
Results of operations of oil and gas producing activities 12,900 (1,677) (9,033)
Total results of operations of oil and gas producing activities $ 13,093 $ (1,703) $ (12,339)