CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Cash flows from operating activities:
Net income	$ 5,094	$ 1,322
Depreciation and amortization	868	945
Deferred income taxes	1,040	(34)
Equity in (earnings) losses of Kronos Worldwide, Inc.	1,477	(5,525)
Dividends received from Kronos Worldwide, Inc.	1,761	1,761
Marketable equity securities	(2,695)	8,552
Benefit plan expense greater than cash funding		311
Noncash interest expense		78
Other, net	21	5
Change in assets and liabilities:
Accounts and other receivables, net	(5,187)	5,601
Inventories, net	268	(863)
Prepaid expenses and other	186	364
Accounts payable and accrued liabilities	(6,604)	(3,579)
Accounts with affiliates	329	170
Accrued environmental remediation and related costs	(71)	(56,511)
Other noncurrent assets and liabilities, net	(29)	(72)
Net cash used in operating activities	(3,542)	(47,475)
Cash flows from investing activities:
Capital expenditures	(404)	(822)
Note receivable from affiliate:
Collections	3,700	500
Loans	(3,100)	(500)
Other		10
Net cash provided by (used in) investing activities	196	(812)
Cash flows from financing activities:
Dividends paid	(4,886)	(4,396)
Dividends paid to noncontrolling interests in subsidiary	(470)	(468)
Net cash used in financing activities	(5,356)	(4,864)
Cash and cash equivalents and restricted cash and cash equivalents - net change from:
Operating, investing and financing activities	(8,702)	(53,151)
Balance at beginning of year	114,053	184,190
Balance at end of period	105,351	131,039
Supplemental disclosures:
Cash paid for interest	11	497
Noncash investing and financing activities:
Change in accruals for capital expenditures	208	$ (352)
Right-of-use asset obtained in exchange for a lease liability	$ 1,014