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Note 2 - Basis of Presentation and Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2023
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   

December 31,

 
   

2023

   

2022

 

Land

  $ 2,139     $ 2,139  

Transportation equipment

    689       691  

Buildings

    530       544  

Leasehold improvements

    209       206  

Field equipment

    4       6  

Furniture and fixtures

    1       1  

Total other property and equipment, net

  $ 3,572     $ 3,587