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Note 2 - Basis of Presentation and Summary of Significant Accounting Policies (Tables)
3 Months Ended
Mar. 31, 2024
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   

March 31,

2024

   

December 31,

2023

 

Land

  $ 2,139     $ 2,139  

Transportation equipment

    688       689  

Buildings

    527       530  

Leasehold improvements

    205       209  

Field equipment

    3       4  

Furniture and fixtures

    1       1  

Total other property and equipment, net

  $ 3,563     $ 3,572