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Note 16 - Fair Value of Financial Instruments (Tables)
9 Months Ended
Sep. 30, 2021
Notes Tables  
Fair Value, Liabilities Measured on Recurring Basis [Table Text Block]
   

Fair Value Measurements at

   

Fair Value Measurements at

 
   

September 30, 2021

   

December 31, 2020

 

Description

 

Level 1

   

Level 2

   

Level 3

   

Level 1

   

Level 2

   

Level 3

 

Interest Rate Swaps

  $     $ (1,224 )   $     $     $ (2,834 )   $  

Commodity Derivatives

  $     $ (167,743 )   $     $     $     $  
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block]
   

September 30, 2021

   

December 31, 2020

 
   

Carrying

   

Fair

   

Carrying

   

Fair

 
   

Amount

   

Value

   

Amount

   

Value

 

Long-Term Debt

  $ 635,201     $ 647,978     $ 610,510     $ 517,862