CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Cash flows from operating activities:
Net income	$ 1,322	$ 7,315
Depreciation and amortization	945	926
Deferred income taxes	(34)	931
Equity in earnings of Kronos Worldwide, Inc.	(5,525)	(2,476)
Dividends received from Kronos Worldwide, Inc.	1,761	6,692
Marketable equity securities	8,552	(2,383)
Benefit plan expense greater than cash funding	311	346
Noncash interest income	0	(492)
Noncash interest expense	78	133
Other, net	5	(19)
Change in assets and liabilities:
Accounts and other receivables, net	5,601	(267)
Inventories, net	(863)	3,107
Prepaid expenses and other	364	286
Accounts payable and accrued liabilities	(3,579)	(5,688)
Accounts with affiliates	170	54
Accrued environmental remediation and related costs	(56,511)	(160)
Other noncurrent assets and liabilities, net	(72)	(1,561)
Net cash provided by (used in) operating activities	(47,475)	6,744
Cash flows from investing activities:
Capital expenditures	(822)	(305)
Proceeds from maturities of marketable securities		24,000
Note receivable from affiliate:
Collections	500	6,000
Loans	(500)	(5,200)
Other	10
Net cash provided by (used in) investing activities	(812)	24,495
Cash flows from financing activities:
Dividends paid	(4,396)	(3,906)
Dividends paid to noncontrolling interests in subsidiary	(468)	(467)
Net cash used in financing activities	(4,864)	(4,373)
Cash and cash equivalents and restricted cash and cash equivalents - net change from:
Operating, investing and financing activities	(53,151)	26,866
Balance at beginning of year	184,190	141,382
Balance at end of period	131,039	168,248
Cash paid (received) for:
Interest	497	13
Income taxes, net		(128)
Noncash investing activities -
Change in accruals for capital expenditures	$ (352)	$ (58)