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Note 3 - Derivative Instruments (Tables)
6 Months Ended
Jun. 30, 2024
Notes Tables  
Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location [Table Text Block]
   

June 30,

   

December 31,

 

Location on Condensed Consolidated Balance Sheet

 

2024

   

2023

 

Prepaid expenses and other current assets (1),(2)

  $ 329     $  

Right-of-use assets and other noncurrent assets (1),(2)

           
    $ 329     $  
Derivative Instruments, Gain (Loss) [Table Text Block]
  

Three Months Ended

  

Six Months Ended

 
  

June 30,

  

June 30,

 

Changes in fair value of derivatives

 

2024

  

2023

  

2024

  

2023

 

Fair value of natural gas derivatives, beginning of period

 $  $151  $  $572 

Purchases of natural gas derivatives

  359      359    

Unrealized losses transferred to realized losses, net

  (112)  (294)  (364)  (546)

Change in unrealized gain (loss) on natural gas derivatives (1)

  82   224   334   55 

Fair value of natural gas derivatives, end of period

 $329  $81  $329  $81 
  

Three Months Ended

  

Six Months Ended

 
  

June 30,

  

June 30,

 

Realized gain (loss) from derivative instruments

 

2024

  

2023

  

2024

  

2023

 

Unrealized gains (losses) transferred to realized gains (losses), net

 $(112) $(294) $(364) $(546)

Derivative settlement payments received (2)

            

Realized gain (loss) from natural gas derivatives, net (2)

 $(112) $(294) $(364) $(546)