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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Income Statement [Abstract]    
Revenues $ 50,141 $ 55,023
Cost of sales 46,784 39,176
Gross profit 3,357 15,847
Earnings of unconsolidated operations 13,824 14,592
Operating expenses    
Selling, general and administrative expenses 14,876 14,784
Amortization of intangible assets 727 847
Gain on sale of assets (236) (136)
Operating expenses 15,367 15,495
Operating profit 1,814 14,944
Other (income) expense    
Interest expense 545 513
Interest income (1,155) (145)
Closed mine obligations 409 380
Gain on equity securities (628) (518)
Other, net (1,725) (230)
Other (income) expense (2,554) 0
Income before income tax (benefit) provision 4,368 14,944
Income tax (benefit) provision (1,324) 2,362
Net income $ 5,692 $ 12,582
Earnings per share:    
Basic earnings per share (in dollars per share) $ 0.77 $ 1.73
Diluted earnings per share (in dollars per share) $ 0.76 $ 1.72
Basic weighted average shares outstanding (in shares) 7,428 7,253
Diluted weighted average shares outstanding (in shares) 7,515 7,321