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

(4)

OTHER LONG-TERM ASSETS (in thousands)

 

  

June 30,

  

December 31,

 
  

2021

  

2020

 

Advanced coal royalties

 $6,573  $6,449 

Other

  1,752   1,809 

Total other assets

 $8,325  $8,258