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Note 2 - Revenue from Contracts with Customers (Tables)
12 Months Ended
Dec. 31, 2022
Notes Tables  
Disaggregation of Revenue [Table Text Block]
  

Years Ended December 31,

 
  

2021

  

2022

 
  

Oil

  

Gas

  

NGL

  

Oil

  

Gas

  

NGL

 
                         

Operating Region

                        

Permian/Delaware Basin

 $32,666  $4,474  $2,181  $39,617  $6,642  $3,456 

Rocky Mountain (1)

 $28,562  $4,182  $6,771  $-  $-  $-