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Note 5 - Derivative Instruments (Tables)
3 Months Ended
Mar. 31, 2022
Notes Tables  
Schedule of Derivative Instruments [Table Text Block]
  

Asset (Liability)

 
  

March 31, 2022

  

December 31, 2021

 
  

Contract

Quantity 

  

Fair Value

  

Contract Quantity 

  

Fair Value

 

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

  250  $1,051   142  $(485)