XML 20 R8.htm IDEA: XBRL DOCUMENT v3.23.1
Note 3 - Inventory
3 Months Ended
Mar. 31, 2023
Notes to Financial Statements  
Inventory Disclosure [Text Block]

(3)

INVENTORY

 

Inventory is valued at a lower of average cost or net realizable value (NRV).  As of March 31, 2023, and December 31, 2022, coal inventory includes NRV adjustments of $3.0 million and $4.9 million, respectively.