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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
OPERATING ACTIVITIES:    
Net income $ 34,632 $ 29,432
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion and amortization 16,511 15,632
Amortization of deferred financing costs 2 6
Deferred income taxes 2,184 2,049
(Gain) loss on sale of property, plant and equipment (210) 41
Stock-based compensation 1,932 1,678
Changes in operating assets and liabilities:    
Trade receivables, net (12,405) (6,263)
Inventories, net (2,367) 450
Prepaid expenses and other current assets 1,082 844
Other assets 10 (86)
Accounts payable and accrued expenses 2,451 266
Other liabilities 96 78
Net cash provided by operating activities 43,918 44,127
INVESTING ACTIVITIES:    
Purchase of property, plant and equipment (18,120) (23,731)
Acquisition of a business, net of cash acquired (5,630)  
Proceeds from sale of property, plant and equipment 504 171
Net cash used in investing activities (23,246) (23,560)
FINANCING ACTIVITIES:    
Cash dividends paid (3,402) (2,715)
Proceeds from exercise of stock options 120 83
Purchase of treasury shares (86) (95)
Net cash used in financing activities (3,368) (2,727)
Net increase in cash and cash equivalents 17,304 17,840
Cash and cash equivalents at beginning of period 105,355 83,562
Cash and cash equivalents at end of period $ 122,659 $ 101,402