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Note 9 - Revenues (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Disaggregation of Revenue [Table Text Block]
   
Year ended December 31,
  
(In thousands)
  
2018
    
2017
    
2016
  
Coal Sales
                        
Domestic revenues
   $
121,433
     $
31,199
     $
-
  
Export revenues
    
106,141
      
27,599
      
2,167
  
Total coal sales
    
227,574
      
58,798
      
2,167
  
Coal Processing
    
-
      
2,238
      
3,049
  
Total revenues
   $
227,574
     $
61,036
     $
5,216