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Note 4 - Derivative Instruments (Tables)
6 Months Ended
Jun. 30, 2023
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

  

2023 (1)

   

2022 (1)

 

Prepaid expenses and other current assets (2)

 $81  $347 

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

     225 
  $81  $572 
Derivative Instruments, Gain (Loss) [Table Text Block]
  

Three Months Ended

  

Six Months Ended

 
  

June 30,

  

June 30,

 

Changes in fair value of derivatives

 

2023

   

2022

   2023   

2022

 

Fair value of natural gas derivatives, beginning of period

 $151  $  $572  $ 

Purchases of natural gas derivatives

     2,241      2,241 

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

  (294)  (216)  (546)  (216)

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

  224   (899)  55   (899)

Fair value of natural gas derivatives, end of period

 $81  $1,126  $81  $1,126 
  

Three Months Ended

  

Six Months Ended

 
  

June 30,

  

June 30,

 

Realized gain (loss) from derivative instruments

 

2023

   

2022

   2023   

2022

 

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

 $(294) $(216) $(546) $(216)

Derivative settlement payments received (2)

     380      380 

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

 $(294) $164  $(546) $164