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15. INCOME TAXES (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Deferred Tax Assets (Liabilities) |  |
Difference in depreciation, depletion, and capitalization methods - oil and natural gas properties | $ 479 | $ 1,863
Net operating losses | 5,507 | 4,131
Impairment - oil and natural gas properties | 0 | (1,122)
Other | 438 | 753
Total deferred tax asset | 6,424 | 5,625
Less valuation allowance | (6,424) | (5,625)
Total deferred tax assets | $ 0 | $ 0

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