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Note 17 - Subsequent Events (Tables)
9 Months Ended
Sep. 30, 2021
Notes Tables  
Schedule of Derivative Instruments [Table Text Block]
  

2021

  

2022

  

2023

 
  

Fourth Quarter

  

First

Quarter

  

Second Quarter

  

Third Quarter

  

Fourth Quarter

  

Total

  

First

Quarter

  

Second Quarter

  

Total

 

Crude Oil Price Swaps - WTI: (a)

                                    

Volume (MBbls)

  540.6   684.0   441.5   146.0   239.0   1,510.5   198.0   200.2   398.2 

Price per Bbl

 $64.35  $67.52  $66.59  $65.88  $59.37  $65.80  $57.22  $57.22  $57.22