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

Fair Value Measurements at

  

Fair Value Measurements at

 
  

June 30, 2021

  

December 31, 2020

 

Description

 

Level 1

  

Level 2

  

Level 3

  

Level 1

  

Level 2

  

Level 3

 

Interest Rate Swaps

 $  $(1,749) $  $  $(2,834) $ 

Commodity Derivatives

 $  $(20,437) $  $  $  $ 
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block]
  

June 30, 2021

  

December 31, 2020

 
  

Carrying

  

Fair

  

Carrying

  

Fair

 
  

Amount

  

Value

  

Amount

  

Value

 

Long-Term Debt

 $651,360  $654,410  $610,510  $517,862