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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

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