Property and Equipment (Details 1) - Unproved properties not subject to depletion [Member] - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]
Oil and gas properties, gross	$ 3,616	$ 1,947
Ventura Basin [Member]
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]
Oil and gas properties, gross	1,595
Indiana [Member]
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]
Oil and gas properties, gross	432	432
Illinois [Member]
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]
Oil and gas properties, gross	142	136
Kentucky [Member]
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]
Oil and gas properties, gross	952	915
Ohio [Member]
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]
Oil and gas properties, gross	66	66
West Virginia [Member]
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]
Oil and gas properties, gross	$ 429	$ 398