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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Cash flows from operating activities:    
Net loss $ (244) $ (740)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation, depletion and amortization 178 304
Change in fair value of oil price risk derivative (54)
Stock-based compensation and services 13 106
Warrant fair value adjustment (270) (340)
Other 8 28
Decrease (increase) in:    
Oil and gas sales receivable (391) (96)
Other assets (5) (140)
Transaction deposit (374)
Increase (decrease) in:    
Accounts payable and accrued liabilities (293) 533
Accrued compensation and benefits 19 12
Net cash used in operating activities (1,413) (333)
Cash flows from investing activities:    
Capital expenditures (46) (21)
Net cash used in investing activities: (46) (21)
Cash flows from financing activities:    
Payment on short-term debt (600)
Proceeds from issuance of common stock, net 877
Net cash provided by financing activities 277
Net decrease in cash and equivalents (1,182) (354)
Cash and equivalents, beginning of period 3,277 2,518
Cash and equivalents, end of period 2,095 2,164
Non-cash investing and financing activities:    
Unrealized loss on marketable securities $ 78 $ 86