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Note 4 - Derivative Instruments (Tables)
12 Months Ended
Dec. 31, 2023
Notes Tables  
Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location [Table Text Block]
  

For the Year Ended December 31,

 

Location on Consolidated Balance Sheet

 

2023

   

2022 (2)

 

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

 $  $347 

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

     225 
  $  $572 
Derivative Instruments, Gain (Loss) [Table Text Block]
  

For the Year Ended December 31,

 

Changes in fair value of derivatives

 

2023

  

2022

 

Fair value of natural gas derivatives, beginning of period

 $572  $ 

Purchases of natural gas derivatives

     2,241 

Realized gains (losses), net

  (1,113)  (791)

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

  541   (878)

Fair value of natural gas derivatives, end of year

 $  $572 
  

For the Year Ended December 31,

 

Realized gain (loss) from derivative instruments

 

2023

  

2022

 

Realized gains (losses), net

 $(1,113) $(791)

Derivative settlement payments received

     1,235 

Derivative settlement payments made

     (31)

Total realized gain (loss) from natural gas derivatives, net (2)

 $(1,113) $413