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Note 11 - Revenues (Tables)
12 Months Ended
Dec. 31, 2021
Revenue from Contract with Customer [Abstract]  
Schedule of disaggregation of revenue

Year ended December 31, 

(In thousands)

2021

    

2020

    

2019

Coal Sales

  

 

  

 

  

North American revenues

$

143,946

$

119,981

$

170,927

Export revenues, excluding Canada

 

139,448

 

48,934

 

59,286

Total revenues

$

283,394

$

168,915

$

230,213