CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Cash Flows [Abstract]
Net income (loss)	$ (484)	$ (484)	$ (3,246)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities
Depreciation, depletion and amortization	253	396	664
Write-off of assets from discontinued operation		25
Impairment of oil and gas properties		2,626
Gain on prepayment of long term debt			(888)
Gain from sale of land			(50)
Changes in operating assets and liabilities
Other current and non-current assets	(22)	223	7
Accounts payable and other liabilities	(384)	178	(95)
Net cash provided by (used) in operating activities	(637)	202	(314)
Cash flows from investing activities
Investment in undeveloped land		(10)
Fixed asset additions			(52)
Cash from sale of land			700
Issuance of note receivable-related party	(4,000)
Collections of note receivable	40	24	38
Net cash provided by (used) in investing activities	(3,960)	14	686
Cash flows from financing activities
Payment on notes payable	(70)	(73)	(732)
Proceeds from the sale of common stock	4,609	163
Net cash provided by (used in) financing activities	4,539	90	(732)
Net increase (decrease) in cash and cash equivalents	(58)	306	(360)
Cash and cash equivalents at beginning of year	419	113	473
Cash and cash equivalents at end of year	361	419	113
Supplemental disclosures of cash flow information
Cash paid for interest on notes payable:	18	24	22
Cash paid for principal on notes payable:	$ 70	$ 73	$ 732