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Note 4 - Miscellaneous Other Income (Tables)
9 Months Ended
Sep. 30, 2020
Notes Tables  
Interest and Other Income [Table Text Block]
   

Three Months Ended September 30,

   

Nine Months Ended September 30,

 
   

2020

   

2019

   

2020

   

2019

 

Contract Buyout

  $     $ 1,193     $ 40,969     $ 3,583  
Sale of Certain Coal Lease Contracts     17,847             17,847        

Royalty Income - Non-Operated Coal

    2,241       4,976       9,638       16,863  

Rental Income

    255       625       1,077       1,923  

Property Easements and Option Income

    19       100       495       1,529  

Interest Income

    76       755       442       2,399  

Purchased Coal Sales

          3,136             9,052  

Other

    563       403       639       1,325  

Miscellaneous Other Income

  $ 21,001     $ 11,188     $ 71,107     $ 36,674