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Note 5 - Derivative Instruments (Tables)
9 Months Ended
Sep. 30, 2023
Notes Tables  
Schedule of Derivative Instruments [Table Text Block]
  

Asset (Liability)

 
  

September 30, 2023

  

December 31, 2022

 
  

Contract Quantity

  

Fair Value

  

Contract Quantity

  

Fair Value

 

Regulated fixed price future commitments, included in other current assets (in thousand barrels)

  182  $(3,665)  305  $(142)