Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
OPERATING ACTIVITIES:
Net income	$ 108,839	$ 74,549	$ 45,429
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	24,169	23,827	22,199
Amortization of deferred financing costs	27	17	2
Deferred income taxes	(1,000)	(923)	2,527
Loss on disposition of property, plant and equipment	49	363	(312)
Stock-based compensation	4,893	3,182	2,636
Changes in operating assets and liabilities:
Trade receivables, net	(5,930)	(4,460)	(6,438)
Inventories	(3,373)	(4,734)	(4,294)
Prepaid expenses and other current assets	(443)	(1,140)	(191)
Other assets	(97)	(142)	8
Accounts payable and accrued expenses	(1,010)	1,666	2,701
Other liabilities	(104)	54	96
Net cash provided by operating activities	126,020	92,259	64,363
INVESTING ACTIVITIES:
Purchase of property, plant and equipment	(27,414)	(34,250)	(26,815)
Acquisition of a business, net of cash acquired			(5,630)
Proceeds from sale of property, plant and equipment	556	2,286	1,294
Net cash used in investing activities	(26,858)	(31,964)	(31,151)
FINANCING ACTIVITIES:
Cash dividends paid	(5,716)	(4,554)	(4,536)
Proceeds from exercise of stock options	130	113	120
Purchase of treasury shares	(3,509)	(1,274)	(767)
Net cash used in financing activities	(9,095)	(5,715)	(5,183)
Net increase in cash and cash equivalents	90,067	54,580	28,029
Cash and cash equivalents at beginning of period	187,964	133,384	105,355
Cash and cash equivalents at end of period	$ 278,031	$ 187,964	$ 133,384