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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash flows from operating activities:    
Net income $ 9,211 $ 5,240
Adjustments to reconcile net income to net cash from operating activities:    
Deferred income taxes (1,134) 1,097
Depreciation and amortization 7,386 6,727
Stock-based compensation 485 383
Other operating adjustments 364 148
Changes in operating assets and liabilities:    
Accounts receivable 1,157 (646)
Inventories (897) (1,049)
Prepaid expenses and other current assets 7 1,086
Other noncurrent assets 134 25
Accounts payable and other accrued liabilities 4,564 2,324
Mining royalty and income taxes payable/receivable, net (1,815) (1,316)
Net cash provided by operating activities 19,462 14,019
Cash flows from investing activities:    
Capital expenditures (15,108) (10,818)
Other investing activities 4 (187)
Net cash used in investing activities (15,104) (11,005)
Cash flows from financing activities:    
Proceeds from the exercise of stock options 1,124  
Dividends paid (571) (568)
Repayment of loan payable (281)  
Repayments of capital leases (189) (1)
Net cash provided by (used in) financing activities 83 (569)
Effect of exchange rate changes on cash and cash equivalents (186) (201)
Net increase (decrease) in cash and cash equivalents 4,255 2,244
Cash and equivalents at beginning of period 22,390 14,166
Cash and equivalents at end of period 26,645 16,410
Supplemental Cash Flow Information    
Interest expense paid 94 13
Income and mining taxes paid 6,298 2,369
Non-cash investing activities:    
(Decrease) increase in accrued capital expenditures $ 918 4,328
Equipment purchased under capital lease   21
Common stock issued for the acquisition of mineral rights   $ 1,300