CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
OPERATING ACTIVITIES:
Net income	$ 22,439	$ 17,104
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	6,054	5,828
Amortization of deferred financing costs	2	2
Deferred income taxes	(238)	(161)
Gain on disposition of property, plant and equipment	(93)	(70)
Stock-based compensation	1,241	812
Changes in operating assets and liabilities:
Trade receivables, net	(4,103)	(4,764)
Inventories	(1,411)	(2,467)
Prepaid expenses and other current assets	639	609
Other assets	15	(6)
Accounts payable and accrued expenses	2,643	3,738
Other liabilities	(21)	19
Net cash provided by operating activities	27,167	20,644
INVESTING ACTIVITIES:
Purchase of property, plant and equipment	(6,824)	(5,451)
Proceeds from sale of property, plant and equipment	156	120
Net cash used in investing activities	(6,668)	(5,331)
FINANCING ACTIVITIES:
Cash dividends paid	(1,426)	(1,137)
Proceeds from exercise of stock options	130	113
Purchase of treasury shares	(172)	(98)
Net cash used in financing activities	(1,468)	(1,122)
Net increase in cash and cash equivalents	19,031	14,191
Cash and cash equivalents at beginning of period	187,964	133,384
Cash and cash equivalents at end of period	$ 206,995	$ 147,575