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Note 16 - Subsequent Events (Tables)
3 Months Ended
Mar. 31, 2021
Notes Tables  
Schedule of Derivative Instruments [Table Text Block]
   
2021
   
2022
 
   
Second
Quarter
   
Third
Quarter
   
Fourth
Quarter
   
Total
   
First
Quarter
   
Second
Quarter
   
Total
 
Oil Price Swaps - WTI: (a)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Volume (Bbls)
   
152,500
     
230,000
     
230,000
     
612,500
     
225,000
     
75,000
     
300,000
 
Price per Bbl
  $
61.40
    $
61.40
    $
61.40
    $
61.40
    $
61.40
    $
61.40
    $
61.40