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Note 5 - Accrued Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2019
Notes Tables |
Schedule of Accrued Liabilities [Table Text Block] |
|  | December 31, |
|  | 201 9 |  |  | 2018 |
Payroll, bonus, and benefits |  | $ | 628 |  |  | $ | 1,163 |
Legal and consulting |  |  | 510 |  |  |  | 405 |
Stock-based compensation |  |  | 71 |  |  |  | 71 |
Well Development |  |  | 1,038 |  |  |  | - |
Northern Pipeline Quality Test |  |  | 1,868 |  |  |  | - |
Other accrued expenses |  |  | 421 |  |  |  | 431 |
|  | $ | 4,536 |  |  | $ | 2,070 |

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