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Note 8 - Revenues (Tables)
3 Months Ended
Mar. 31, 2022
Revenue from Contract with Customer [Abstract]  
Schedule of disaggregation of revenue

Three months ended March 31, 

(In thousands)

    

2022

    

2021

Coal Sales

 

  

 

  

North American revenue

$

60,094

$

20,107

Export revenue, excluding Canada

 

94,788

 

23,348

Total revenue

$

154,882

$

43,455