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Note 14 - Derivatives (Tables)
3 Months Ended
Mar. 31, 2022
Notes Tables  
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]
   

March 31, 2022

   

December 31, 2021

 
   

Asset Derivatives

   

Liability Derivatives

   

Asset Derivatives

   

Liability Derivatives

 

Coal Swap Contracts

  $ 75,132     $ (275,317 )   $ 1,086     $ (53,290 )

Effect of Counterparty Netting

    (75,132 )     75,132       (1,086 )     1,086  

Net Derivatives as Classified in the Consolidated Balance Sheets

  $     $ (200,185 )   $     $ (52,204 )