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Note 2 - Basis of Presentation and Summary of Significant Accounting Policies (Tables)
 3 Months Ended
Mar. 31, 2021
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
March 31,
2021
    
December 31,
2020
  
Land
   $
725
     $
725
  
Information technology
    
250
      
292
  
Transportation equipment
    
39
      
41
  
Leasehold improvements
    
20
      
24
  
Field equipment
    
10
      
10
  
Total other property and equipment, net
   $
1,044
     $
1,092