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Note 4 - Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2022
Notes Tables  
Fair Value, Liabilities Measured on Recurring Basis [Table Text Block]
   

As of June 30, 2022

 
   

Quoted Prices

in

Active Markets

for

Identical Assets

(Level 1)

   

Significant

Other

Observable

Inputs

(Level 2)

   

Significant

Unobservable

Inputs

(Level 3)

   

Total

 
Assets:                                

Commodity price derivatives

  $     $ 8,002     $     $ 8,002  
Liabilities:                                

Commodity price derivatives

          39,911             39,911  

Total recurring fair value measurements

  $     $ (31,909 )   $     $ (31,909

)

   

As of December 31, 2021

 
   

Quoted Prices

in

Active Markets

for

Identical Assets

(Level 1)

   

Significant

Other

Observable

Inputs

(Level 2)

   

Significant

Unobservable

Inputs

(Level 3)

   

Total

 
Assets:                                

Commodity price derivatives

  $     $ 2,199     $     $ 2,199  
Liabilities:                                

Commodity price derivatives – current

          13,591             13,591  

Commodity price derivatives – noncurrent

          4,075             4,075  

Total liabilities

          17,666             17,666  

Total recurring fair value measurements

  $     $ (15,467 )   $     $ (15,467 )
Fair Value, by Balance Sheet Grouping [Table Text Block]
   

As of June 30, 2022

   

As of December 31, 2021

 
   

Carrying

Value

   

Fair Value

   

Carrying

Value

   

Fair Value

 
Assets:                                

Cash and cash equivalents

  $ 22,417     $ 22,417     $ 34,869     $ 34,869  
Liabilities:                                
Long-term debt:                                

Senior Notes (a)

  $ 225,000     $ 225,000     $     $