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Note 8 - Income Taxes - Tax Years Subject to Examination (Details) | 12 Months Ended
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Dec. 31, 2023
Domestic Tax Authority [Member] | UNITED STATES | Minimum [Member] |
Jurisdiction | 2014
Domestic Tax Authority [Member] | UNITED STATES | Maximum [Member] |
Jurisdiction | 2023
Foreign Tax Authority [Member] | GABON | Minimum [Member] |
Jurisdiction | 2019
Foreign Tax Authority [Member] | GABON | Maximum [Member] |
Jurisdiction | 2023
Foreign Tax Authority [Member] | EGYPT | Minimum [Member] |
Jurisdiction | 2017
Foreign Tax Authority [Member] | EGYPT | Maximum [Member] |
Jurisdiction | 2023
Foreign Tax Authority [Member] | CANADA | Minimum [Member] |
Jurisdiction | 2018
Foreign Tax Authority [Member] | CANADA | Maximum [Member] |
Jurisdiction | 2023

X
- Definition Tax year being audited in the income tax examination, in YYYY format. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | dtr-types:gYearListItemType
Balance Type: | na
Period Type: | duration

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=country_GA
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=country_EG
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=country_CA
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |