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Unaudited Condensed Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Income Statement [Abstract]        
Revenues $ 51,742 $ 32,295 $ 142,743 $ 105,294
Cost of sales 37,413 25,475 111,737 89,553
Gross profit 14,329 6,820 31,006 15,741
Earnings of unconsolidated operations 17,652 15,145 46,536 44,926
Contract termination settlement 10,333 0 10,333 0
Operating expenses        
Selling, general and administrative expenses 13,830 11,833 40,471 37,151
Amortization of intangible assets 902 734 2,795 2,303
(Gain) loss on sale of assets (10) 0 17 (247)
Operating expenses 14,722 12,567 43,283 39,207
Operating profit 27,592 9,398 44,592 21,460
Other expense (income)        
Interest expense 493 336 1,208 1,069
Interest income (101) (95) (321) (625)
Closed mine obligations 372 395 1,119 1,219
Gain on equity securities (445) (35) (2,530) (351)
Other, net (161) (1,082) (418) (1,411)
Other (income) expense 158 (481) (942) (99)
Income before income tax provision 27,434 9,879 45,534 21,559
Income tax provision 2,597 1,857 5,231 1,321
Net income $ 24,837 $ 8,022 $ 40,303 $ 20,238
Earnings per share:        
Basic earnings per share (in dollars per share) $ 3.47 $ 1.14 $ 5.65 $ 2.88
Diluted earnings per share (in dollars per share) $ 3.47 $ 1.14 $ 5.63 $ 2.88
Basic weighted average shares outstanding (in shares) 7,165 7,036 7,136 7,019
Diluted weighted average shares outstanding (in shares) 7,165 7,036 7,153 7,035