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Note 8 - Revenue (Tables)
9 Months Ended
Sep. 30, 2022
Revenue from Contract with Customer [Abstract]  
Schedule of disaggregation of revenue

Three months ended September 30, 

Nine months ended September 30, 

(In thousands)

    

2022

    

2021

2022

    

2021

Coal Sales

 

  

 

  

  

 

  

North American revenue

$

78,442

$

47,954

$

231,365

$

105,611

Export revenue, excluding Canada

 

58,483

 

28,423

 

199,096

 

90,278

Total revenue

$

136,925

$

76,377

$

430,461

$

195,889