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Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Restricted cash and cash equivalents | $ 1,165 | $ 1,164 |
Capitalized Drilling Costs | 17,600 | 11,200 | $ 5,200
Foreign exchange gain (loss), net | $ (3,810) | $ 7,211 | $ 417
Minimum [Member] |  |  |
Property, Plant and Equipment, Useful Life (Year) | 3 years |  |
Maximum [Member] |  |  |
Property, Plant and Equipment, Useful Life (Year) | 14 years |  |

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