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Note 13 - Derivatives (Tables)
9 Months Ended
Sep. 30, 2022
Notes Tables  
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]
   

September 30, 2022

   

December 31, 2021

 
   

Asset Derivatives

   

Liability Derivatives

   

Asset Derivatives

   

Liability Derivatives

 

Coal Swap Contracts

  $ 41,350     $ (132,836 )   $ 1,086     $ (53,290 )

Effect of Counterparty Netting

    (41,350 )     41,350       (1,086 )     1,086  

Net Derivatives as Classified in the Consolidated Balance Sheets

  $     $ (91,486 )   $     $ (52,204 )