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Note 4 - Other Long-term Assets
9 Months Ended
Sep. 30, 2021
Notes to Financial Statements  
Other Assets Disclosure [Text Block]

(4)

OTHER LONG-TERM ASSETS (in thousands)

 

   

September 30,

   

December 31,

 
   

2021

   

2020

 

Advanced coal royalties

  $ 6,705     $ 6,449  

Other

    1,723       1,809  

Total other assets

  $ 8,428     $ 8,258