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Note 2 - Revenue From Contracts With Customers (Tables)
 3 Months Ended
Mar. 31, 2020
Notes Tables  
Disaggregation of Revenue [Table Text Block]
   
Three Months Ended March 31,
  
   
2020
    
2019
  
   
Oil
    
Gas
    
NGL
    
Oil
    
Gas
    
NGL
  
Operating Regions:
      
 
      
 
      
 
      
 
      
 
      
 
Permian/Delaware Basin
   $
8,507
     $
14
     $
(2
 )   $
9,063
     $
287
     $
313
  
Rocky Mountain
   $
7,028
     $
72
     $
99
     $
21,800
     $
954
     $
740
  
South Texas
   $
-
     $
-
     $
-
     $
1,118
     $
232
     $
3