CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash flows from operating activities:
Net income (loss)	$ 7,315	$ (5,939)
Depreciation and amortization	926	1,010
Deferred income taxes	931	1,362
Equity in (earnings) losses of Kronos Worldwide, Inc.	(2,476)	4,637
Dividends received from Kronos Worldwide, Inc.	6,692	6,692
Marketable equity securities	(2,383)	5,498
Benefit plan expense less than cash funding	346	330
Noncash interest income	(492)	(800)
Noncash interest expense	133	187
Other, net	(19)	(8)
Change in assets and liabilities:
Accounts and other receivables, net	(267)	(845)
Inventories, net	3,107	1,012
Prepaid expenses and other	286	172
Accounts payable and accrued liabilities	(5,688)	(4,498)
Accounts with affiliates	54	(253)
Accrued environmental remediation and related costs	(160)	(836)
Other noncurrent assets and liabilities, net	(1,561)	(443)
Net cash provided by operating activities	6,744	7,278
Cash flows from investing activities:
Capital expenditures	(305)	(270)
Purchases	0	(32,824)
Proceeds from maturities	24,000	8,000
Note receivable from affiliate:
Collections	6,000	7,800
Loans	(5,200)	(6,800)
Net cash provided by (used in) investing activities	24,495	(24,094)
Cash flows from financing activities:
Dividends paid	(3,906)	(3,417)
Dividends paid to noncontrolling interests in subsidiary	(467)	(388)
Net cash used in financing activities	(4,373)	(3,805)
Cash and cash equivalents and restricted cash and cash equivalents - net change from:
Operating, investing and financing activities	26,866	(20,621)
Balance at beginning of year	141,382	97,502
Balance at end of period	168,248	76,881
Supplemental disclosures - cash paid (received) for:
Interest	13	12
Income taxes, net	$ (128)	$ 171