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Unaudited Condensed Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Income Statement [Abstract]    
Revenues $ 45,105 $ 37,644
Cost of sales 37,413 32,563
Gross profit 7,692 5,081
Earnings of unconsolidated operations 15,342 16,003
Operating expenses    
Selling, general and administrative expenses 13,763 12,727
Amortization of intangible assets 982 777
Gain on sale of assets (41) 0
Operating expenses 14,704 13,504
Operating profit 8,330 7,580
Other (income) expense    
Interest expense 356 403
Interest income (120) (401)
Closed mine obligations 383 434
(Gain) loss on equity securities (823) 1,196
Other, net (130) (148)
Other (income) expense (334) 1,484
Income before income tax benefit 8,664 6,096
Income tax benefit (297) (70)
Net income $ 8,961 $ 6,166
Earnings per share:    
Basic earnings per share (in dollars per share) $ 1.26 $ 0.88
Diluted earnings per share (in dollars per share) $ 1.25 $ 0.88
Basic weighted average shares outstanding (in shares) 7,101 7,000
Diluted weighted average shares outstanding (in shares) 7,142 7,040