XML 26 R9.htm IDEA: XBRL DOCUMENT v3.22.1
Note 3 - Inventory
3 Months Ended
Mar. 31, 2022
Notes to Financial Statements  
Inventory Disclosure [Text Block]

(3)

INVENTORY

 

Inventory is valued at lower of average cost or net realizable value (NRV).  As of March 31, 2022, and December 31, 2021, coal inventory includes NRV adjustments of $5.0 million and $3.8 million, respectively.