CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
OPERATING ACTIVITIES:
Net income	$ 17,104	$ 8,668
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	5,828	5,250
Amortization of deferred financing costs	2	2
Deferred income taxes	(161)	438
Gain on disposition of property, plant and equipment	(70)	(52)
Stock-based compensation	812	651
Changes in operating assets and liabilities:
Trade receivables, net	(4,764)	(5,678)
Inventories, net	(2,467)	(1,255)
Prepaid expenses and other current assets	609	992
Other assets	(6)	6
Accounts payable and accrued expenses	3,738	(988)
Other liabilities	19	25
Net cash provided by operating activities	20,644	8,059
INVESTING ACTIVITIES:
Purchase of property, plant and equipment	(5,451)	(5,517)
Acquisition of a business, net of cash acquired		(5,889)
Proceeds from sale of property, plant and equipment	120	75
Net cash used in investing activities	(5,331)	(11,331)
FINANCING ACTIVITIES:
Cash dividends paid	(1,137)	(1,133)
Proceeds from exercise of stock options	113
Purchase of treasury shares	(98)	(86)
Net cash used in financing activities	(1,122)	(1,219)
Net increase (decrease) in cash and cash equivalents	14,191	(4,491)
Cash and cash equivalents at beginning of period	133,384	105,355
Cash and cash equivalents at end of period	$ 147,575	$ 100,864