v3.26.1
BUSINESS SEGMENTS (Segment Reconciliation) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Segment Reporting [Line Items]        
Total consolidated sales $ 66,685 $ 67,536 $ 165,370 $ 162,063
Total gross margin for reportable segments 16,649 12,361 34,321 25,682
Selling and administrative 10,022 8,925 21,295 18,080
Impairment of long-lived assets 0 1,204 0 1,866
Gain on disposal of assets (6) (1,262) (34) (1,422)
Accretion of asset retirement obligation 777 650 1,553 1,299
Other operating income (1,129) (1,222) (2,289) (2,505)
Other operating expense 5,922 2,654 6,508 3,250
Other operating expense 5,922 2,654 6,508 3,250
Equity in loss of unconsolidated entities 11 232 11 232
Interest Expense 0 66 0 171
Interest income (1,327) (651) (1,994) (1,026)
Other non-operating (income) expense (73) 354 (121) 820
Income from Continuing Operations Before Income Taxes 2,452 1,411 9,392 4,917
Mineral [Member]        
Segment Reporting [Line Items]        
Total consolidated sales     165,370 162,063
Cost of goods sold (35,670) (40,631) (95,287) (99,521)
Operating Segments [Member]        
Segment Reporting [Line Items]        
Total consolidated sales 66,685 67,594 165,370 162,180
Intersegment Eliminations [Member]        
Segment Reporting [Line Items]        
Cost of goods sold 0 58 0 117
Intersegment Eliminations [Member] | Mineral [Member]        
Segment Reporting [Line Items]        
Total consolidated sales $ 0 $ (58) $ 0 $ (117)