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LIQUIDITY AND GOING CONCERN (Details Narrative) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Sep. 14, 2016 USD ($) | Feb. 29, 2016 USD ($) | Jan. 31, 2016 Number | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2015 USD ($)
Working capital |  |  |  |  |  | $ 9,091 |  |  |  |
Accumulated deficit |  |  |  | $ (124,788) |  | (124,788) |  |  |  | $ (109,705)
Net loss |  |  |  | (265) | $ (23,651) | (15,083) | $ (53,634) |  |  |
Current portion of long-term debt |  |  |  | $ 6,000 |  | 6,000 |  |  |  | $ 6,000
Amount of reduction in overhead |  |  |  |  |  | 4,000 |  |  |  |
General and administrative expenses |  |  |  |  |  | $ 2,360 |  |  |  |
Percentage of production barrel oil |  |  |  | 53.00% |  | 53.00% |  |  |  |
Reduction in mining expense |  |  |  |  |  | $ 373 | $ 2,385 |  |  |
Cash and equivalents |  |  |  | $ 1,204 |  | 1,204 |  |  |  |
Mining expense |  |  |  |  |  | 7,000 |  |  |  |
Mining Segment [Member] |  |  |  |  |  |  |  |  |  |
Reduction in mining expense |  |  |  |  |  | $ 2,012 |  |  |  |
Credit Agreement [Member] | Wells Fargo Bank, National Association [Member] |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  |  | Jul. 30, 2017 |  |  |  |
Earnings And Participation Agreement (the "Agreement") [Member] | IronHorse Resources LLC ("IronHorse") [Member] |  |  |  |  |  |  |  |  |  |
Drilling and completion costs | $ 9,600 |  |  |  |  | $ 9,600 |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Funds requirement for proved undeveloped oil and gas properties |  |  |  |  |  |  |  | $ 3,800 | $ 1,000 |
Minimum [Member] |  |  |  |  |  |  |  |  |  |
Number of employees | Number |  |  | 1 |  |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |
Number of employees | Number |  |  | 14 |  |  |  |  |  |  |
Series A Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |
Amount of reduction in overhead |  | $ 3,000 |  |  |  |  |  |  |  |

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