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Note 11 - Revenue (Tables)
12 Months Ended
Dec. 31, 2023
Revenue from Contract with Customer [Abstract]  
Schedule of disaggregation of revenue

Year ended December 31, 

(In thousands)

    

2023

    

2022

    

2021

Coal Sales

 

  

 

  

 

  

North American revenue

$

227,484

$

328,322

$

143,946

Export revenue, excluding Canada

 

466,040

 

237,366

 

139,448

Total revenue

$

693,524

$

565,688

$

283,394