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Note 17 - Subsequent Events (Tables)
12 Months Ended
Dec. 31, 2021
Notes Tables  
Schedule of Derivative Instruments, Included Additional Crude Oil Decretive Financial Instruments [Table Text Block]
  

2022

  

2023

 
  

First

Quarter

  

Second

Quarter

  

Third

Quarter

  

Fourth

Quarter

  

Total

  

First

Quarter

  

Second

Quarter

  

Total

 

Crude Oil Price Swaps - WTI: (a)

                                

Volume (MBbls)

  966.4   1,039.8   456.4   487.4   2,950.0   441.0   200.2   641.2 

Price per Bbl

 $69.26  $71.96  $75.15  $70.14  $71.27  $70.05  $57.22  $66.04