Transactions (Details 1) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018
Revenues:
Oil and gas sales	$ 635	$ 5,401
Expenses:
Production and ad valorem taxes	39	484
Lease operating expenses	114	510
Transportation and marketing	153	332
Depreciation, depletion and amortization	181	1,574
General, administrative and other	51	325
Total expenses	538	3,225
Operating income	97	2,176
Other income (expense):
Other income	2	2
Interest expense	(8)	(39)
Total other income (expense)	(6)	(37)
Net income	$ 91	$ 2,139