CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cash flows from operating activities:
Net income	$ (5,939)	$ 19,209
Depreciation and amortization	1,010	961
Deferred income taxes	1,362	2,688
Equity in earnings of Kronos Worldwide, Inc.	4,637	(17,533)
Dividends received from Kronos Worldwide, Inc.	6,692	6,692
Marketable equity securities	5,498	(671)
Benefit plan expense greater (less) than cash funding	330	306
Noncash interest expense	187	239
Other, net	(808)	(73)
Change in assets and liabilities:
Accounts and other receivables, net	(845)	(2,172)
Inventories, net	1,012	(2,490)
Prepaid expenses and other	172	(1,037)
Accounts payable and accrued liabilities	(4,498)	(2,966)
Accounts with affiliates	(253)	7
Accrued environmental remediation and related costs	(836)	(35)
Other noncurrent assets and liabilities, net	(443)	(130)
Net cash provided by operating activities	7,278	2,995
Cash flows from investing activities:
Capital expenditures	(270)	(1,717)
Proceeds from maturities	8,000
Note receivable from affiliate:
Collections	7,800	7,700
Loans	(6,800)	(7,100)
Purchases of marketable securities	(32,824)
Net cash provided by (used in) investing activities	(24,094)	(1,117)
Cash flows from financing activities:
Dividends paid	(3,417)	(3,416)
Dividends paid to noncontrolling interests in subsidiary	(388)	(406)
Net cash used in financing activities	(3,805)	(3,822)
Cash and cash equivalents and restricted cash and cash equivalents - net change from:
Operating, investing and financing activities	(20,621)	(1,944)
Balance at beginning of year	97,502	175,242
Balance at end of year	76,881	173,298
Supplemental disclosures - cash paid for:
Interest	12	6
Income taxes, net	$ 171	$ 9