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Note 2 - Basis of Presentation and Summary of Significant Accounting Policies - Other Property and Equipment, Net (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Other property and equipment, net | $ 3,539 | $ 3,587
Land [Member] |  |
Other property and equipment, net | 2,139 | 2,139
Transportation Equipment [Member] |  |
Other property and equipment, net | 648 | 691
Building [Member] |  |
Other property and equipment, net | 534 | 544
Leasehold Improvements [Member] |  |
Other property and equipment, net | 213 | 206
Field Equipment [Member] |  |
Other property and equipment, net | 4 | 6
Furniture and Fixtures [Member] |  |
Other property and equipment, net | $ 1 | $ 1

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