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Consolidated Statements of Operations - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Consolidated Statements of Operations        
Sales, net $ 30,768 $ 21,391 $ 62,919 $ 45,727
Mine cost of sales:        
Production costs 17,579 12,177 33,114 23,512
Depreciation and amortization 3,579 3,953 7,072 6,509
Reclamation and remediation 89 35 292 64
Total mine cost of sales 21,247 16,165 40,478 30,085
Mine gross profit 9,521 5,226 22,441 15,642
Costs and expenses:        
General and administrative expenses 2,225 1,675 4,579 3,487
Exploration expenses 1,251 1,136 2,436 1,958
Other expense, net 510 609 788 1,073
Total costs and expenses 3,986 3,420 7,803 6,518
Income before income taxes 5,535 1,806 14,638 9,124
Provision for income taxes 1,781 942 5,427 3,884
Net income $ 3,754 $ 864 $ 9,211 $ 5,240
Net income per common share:        
Basic $ 0.07 $ 0.02 $ 0.16 $ 0.09
Diluted $ 0.06 $ 0.02 $ 0.16 $ 0.09
Weighted average shares outstanding:        
Basic 57,315,472 56,839,823 57,218,389 56,818,406
Diluted 58,314,123 57,375,938 58,153,350 57,744,817