REVENUE AND COST OF SALES (Details1) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
REVENUE AND COST OF SALES
Production costs	$ 7,407	$ 4,987	$ 14,711	$ 10,834
Write down of equipment and materials and supplies inventory	91	0	91	0
Depreciation and depletion	677	481	1,347	940
Total cost	$ 8,175	$ 5,468	$ 16,149	$ 11,774

The amount of all expenses directly or indirectly attributed to the goods or services sold. Attributed expenses include, but are not limited to, costs previously included in the measurement of inventory that has now been sold, such as depreciation and maintenance of factory buildings and equipment used in the production process, unallocated production overheads, and abnormal amounts of production costs of inventories.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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