CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Cash Flows [Abstract]
Net income (loss)	$ (3,246)	$ 48	$ (2,622)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities
Depreciation, depletion and amortization	396	664	721
Write-off of assets from discontinued operation	25	0	0
Impairment of oil and gas properties	2,626	0	2,717
Write-off (recovery) of affiliate receivable	0	0	(1,430)
Gain on prepayment of long term debt	0	(888)	0
Gain from sale of land	0	(50)	0
Changes in operating assets and liabilities
Other current and non-current assets	223	7	260
Accounts payable and other liabilities	178	(95)	920
Net cash provided by (used) in operating activities	202	(314)	566
Cash flows from investing activities
Investment in undeveloped land	(10)	0	0
Investment in oil and gas properties	0	0	(336)
Fixed asset additions	0	(52)	(31)
Cash from sale of land	0	700	116
Repayment of loan from affiliate	0	0	126
Collections of note receivable	24	38	13
Net cash provided by (used) in investing activities	14	686	(112)
Cash flows from financing activities
Payment on notes payable	(73)	(732)	(281)
Proceeds from the sale of common stock	163	0	0
Net cash provided by (used in) financing activities	90	(732)	(281)
Net increase (decrease) in cash and cash equivalents	306	(360)	173
Cash and cash equivalents at beginning of year	113	473	300
Cash and cash equivalents at end of year	419	113	473
Supplemental disclosures of cash flow information
Cash paid for interest on notes payable:	24	22	77
Cash paid for principal on notes payable:	73	73	281
Non cash portion of sale of land	$ 0	$ 0	$ 415