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Note 8 - Revenue (Tables)
3 Months Ended
Mar. 31, 2024
Revenue from Contract with Customer [Abstract]  
Schedule of disaggregation of revenue

Three months ended March 31, 

(In thousands)

    

2024

    

2023

Coal Sales

 

  

 

  

North American revenue

$

54,173

$

40,027

Export revenue, excluding Canada

 

118,503

 

126,333

Total revenue

$

172,676

$

166,360