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Note 24 - Related Party Transactions (Tables)
12 Months Ended
Dec. 31, 2020
Notes Tables  
Schedule of Related Party Transactions [Table Text Block]
  

For the Years Ended December 31,

 
  

2020

  

2019

  

2018

 

Operating and Other Costs

 $3,820  $3,219  $2,918 

Selling, General and Administrative Costs

  9,604   8,309   8,300 

Total Services from CONSOL Energy

 $13,424  $11,528  $11,218