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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
 [1]
Cash flows from operating activities:    
Net income (loss) $ 15 $ (322) [2]
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Depreciation, depletion, accretion, and amortization 213 178
Debt issuance cost amortization 7 3
Change in fair value of commodity derivative (54)
(Gain) loss on marketable equity securities (12) 78 [2]
Gain on warrant revaluation (8) (270)
Stock-based compensation 13 13 [2]
Other 5
Decrease (increase) in:    
Oil and natural gas sales receivable (184) (391)
Transaction deposit (50) (124)
Other assets 60 (255)
Increase (decrease) in:    
Accounts payable and accrued liabilities 63 (293)
Accrued compensation and benefits 3 19
Payments on operating lease liability (12)
Net cash provided by (used in) operating activities 108 (1,413)
Cash flows from investing activities:    
Oil and natural gas capital expenditures (186) (44)
Purchase of property and equipment (1) (2)
Net cash used in investing activities: (187) (46)
Cash flows from financing activities:    
Issuance of common stock, net of fees 877
Payments on credit facility (937) (600)
Payments on insurance premium finance note payable (68)
Net cash (used in) provided by financing activities (1,005) 277
Net decrease in cash and equivalents (1,084) (1,182)
Cash and equivalents, beginning of period 2,340 3,277
Cash and equivalents, end of period 1,256 2,095
Supplemental disclosures of cash flow information and non-cash activities:    
Cash payments for interest 22 52
Investing activities:    
Change in capital expenditure accruals (295)
Adoption of lease standard 228
Asset retirement obligations (15)
Financing activities:    
Financing of insurance premiums with note payable $ 228
[1] The condensed consolidated statement of cash flows for the three months ended March 31, 2018 was restated to include the loss due to the change in the fair value of marketable equity securities of $78 thousand in net loss. The amount was originally included in other comprehensive loss.
[2] The condensed consolidated statement of operations for the three months ended March 31, 2018 was restated to include the loss on marketable equity securities in non-operating income rather than other comprehensive income as originally reported.