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Note 13 - Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2023
Notes Tables |
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] |
As of December 31, 2023
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Net Fair Value |
|  | Quoted Prices in |  |  |  |  |  |  | Significant |  |  |  |  |  |  |  |  |  |  | Presented in the |
|  | Active Markets for |  |  | Significant Other |  |  | Unobservable |  |  |  |  |  |  |  |  |  | Consolidated |
|  | Identical Assets |  |  | Observable Inputs |  |  | Inputs |  |  | Total |  |  | Effect of |  |  | Balance |
|  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |  |  | Fair Value |  |  | Netting |  |  | Sheet |
|  | (in thousands) |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity derivatives |  | $ | - |  |  | $ | 1,844 |  |  | $ | - |  |  | $ | 1,844 |  |  | $ | - |  |  | $ | 1,844 |
Net derivative instruments |  | $ | - |  |  | $ | 1,844 |  |  | $ | - |  |  | $ | 1,844 |  |  | $ | - |  |  | $ | 1,844 |
As of December 31, 2022 |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Net Fair Value |
|  | Quoted Prices in |  |  |  |  |  |  | Significant |  |  |  |  |  |  |  |  |  |  | Presented in the |
|  | Active Markets for |  |  | Significant Other |  |  | Unobservable |  |  |  |  |  |  |  |  |  |  | Consolidated |
|  | Identical Assets |  |  | Observable Inputs |  |  | Inputs |  |  | Total |  |  | Effect of |  |  | Balance |
|  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |  |  | Fair Value |  |  | Netting |  |  | Sheet |
|  | (in thousands) |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity derivatives |  | $ | - |  |  | $ | 488 |  |  | $ | - |  |  | $ | 488 |  |  | $ | (488 | ) |  | $ | - |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity derivatives |  | $ | - |  |  | $ | (2,182 | ) |  | $ | - |  |  | $ | (2,182 | ) |  | $ | 488 |  |  | $ | (1,694 | )
Net derivative instruments |  | $ | - |  |  | $ | (1,694 | ) |  | $ | - |  |  | $ | (1,694 | ) |  | $ | - |  |  | $ | (1,694 | )
Fair Value, Assets Measured on Recurring Basis [Table Text Block] |
|  | December 31, |
|  | 2023 |  |  | 2022 |
Number of shares owned |  |  | 2,421,180 |  |  |  | 2,421,180 |
Quoted market price |  | $ | 0.06789 |  |  | $ | 0.04429 |
Fair value |  | $ | 164,375 |  |  | $ | 107,234 |

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