CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Cash flows from operating activities:
Net income (loss)	$ (35,371)	$ 69,261	$ 582
Depreciation and amortization	3,652	3,691	3,973
Deferred income taxes	(16,221)	13,718	(7,308)
Equity in (earnings) losses of Kronos Worldwide, Inc.	33,940	(26,381)	15,003
Dividends received from Kronos Worldwide, Inc.	7,044	16,905	26,766
Marketable equity securities (gain) loss	13,582	(9,821)	8,156
Settlement loss on pension plan termination and buy-out	19,670		4,911
Benefit plan expense greater than cash funding	31	397	461
Noncash interest income		(817)	(3,591)
Noncash interest expense	236	479	695
Other, net	374	217	247
Change in assets and liabilities:
Accounts and other receivables, net	9,921	(6,679)	754
Inventories, net	(2,334)	2,126	333
Prepaid expenses and other	188	82	42
Accounts payable and accrued liabilities	(15,940)	(13,256)	(12,624)
Accounts with affiliates	88	700	578
Accrued environmental remediation and related costs	(56,238)	(21,828)	(1,252)
Other noncurrent assets and liabilities, net	975	(3,220)	(723)
Net cash provided by (used in) operating activities	(36,403)	25,574	37,003
Cash flows from investing activities:
Capital expenditures	(3,747)	(1,432)	(1,130)
Marketable securities:
Purchases			(61,366)
Proceeds from maturities		54,000	82,000
Note receivable from affiliate:
Collections	17,000	26,300	30,500
Loans	(15,700)	(25,000)	(27,900)
Proceeds from land sale		5,000
Other, net	10
Net cash provided by (used in) investing activities	(2,437)	58,868	22,104
Cash flows from financing activities:
Dividends paid	(27,850)	(36,634)	(13,672)
Dividends paid to noncontrolling interests in subsidiary	(3,447)	(5,000)	(1,555)
Net cash used in financing activities	(31,297)	(41,634)	(15,227)
Cash and cash equivalents and restricted cash and cash equivalents - net change from:
Operating, investing and financing activities	(70,137)	42,808	43,880
Balance at beginning of year	184,190	141,382	97,502
Balance at end of year	114,053	184,190	141,382
Cash paid (received) for:
Interest	531	51	50
Income taxes, net	101	127	(300)
Noncash investing activities -
Change in accruals for capital expenditures	$ (412)	$ 423	$ 23