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Note 15 - Fair Value of Financial Instruments (Tables)
3 Months Ended
Mar. 31, 2022
Notes Tables  
Fair Value, Liabilities Measured on Recurring Basis [Table Text Block]
   

Fair Value Measurements at

   

Fair Value Measurements at

 
   

March 31, 2022

   

December 31, 2021

 

Description

 

Level 1

   

Level 2

   

Level 3

   

Level 1

   

Level 2

   

Level 3

 

Commodity Derivatives

  $     $ (200,185 )   $     $     $ (52,204 )   $  

Interest Rate Swaps

  $     $ 5     $     $     $ (517 )   $  
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block]
   

March 31, 2022

   

December 31, 2021

 
   

Carrying

   

Fair

   

Carrying

   

Fair

 
   

Amount

   

Value

   

Amount

   

Value

 

Long-Term Debt

  $ 581,748     $ 599,734     $ 613,752     $ 628,431