XML 44 R33.htm IDEA: XBRL DOCUMENT v3.22.2.2
Note 7 - Inventories (Tables)
9 Months Ended
Sep. 30, 2022
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   

September 30,

   

December 31,

 
   

2022

   

2021

 

Coal

  $ 24,299     $ 12,078  

Supplies

    50,656       50,798  

Total Inventories

  $ 74,955     $ 62,876