CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities:
Net income	$ 36,456	$ 53,360	$ 16,103
Depreciation and amortization	3,977	3,839	3,827
Deferred income taxes	2,291	7,453	(2,530)
Equity in earnings of Kronos Worldwide, Inc.	(31,873)	(34,323)	(19,437)
Dividends received from Kronos Worldwide, Inc.	26,766	25,356	25,356
Marketable equity securities	8,085	(16,229)	8,671
Benefit plan expense greater (less) than cash funding	130	(220)	(792)
Noncash interest expense	908	1,116	1,321
Other, net	(288)	(31)	93
Change in assets and liabilities:
Accounts and other receivables, net	(2,275)	(4,488)	1,121
Inventories, net	(5,832)	(7,479)	(193)
Prepaid expenses and other	353	(991)	(237)
Accounts payable and accrued liabilities	(10,395)	(9,399)	(13,163)
Income taxes	(3)	13	(77)
Accounts with affiliates	(662)	279	193
Accrued environmental remediation and related costs	(582)	(476)	(1,092)
Other noncurrent assets and liabilities, net	(125)	(171)	(141)
Net cash provided by operating activities	26,931	17,609	19,023
Cash flows from investing activities:
Capital expenditures	(3,695)	(4,094)	(1,740)
Note receivable from affiliate:
Collections	29,800	40,600	33,428
Loans	(24,300)	(29,800)	(34,828)
Purchases of marketable securities	(69,959)
Other, net	284	2
Net cash provided by (used in) investing activities	(67,870)	6,708	(3,140)
Cash flows from financing activities:
Dividends paid	(30,753)	(11,712)	(7,805)
Subsidiary treasury stock acquired	(1,744)	(1,311)
Dividends paid to noncontrolling interests in subsidiary	(4,304)	(1,324)	(676)
Net cash used in financing activities	(36,801)	(14,347)	(8,481)
Cash and cash equivalents and restricted cash and cash equivalents - net change from:
Operating, investing and financing activities	(77,740)	9,970	7,402
Balance at beginning of year	175,242	165,272	157,870
Balance at end of year	97,502	175,242	165,272
Supplemental disclosures - cash paid for:
Interest	34	26	27
Income taxes, net	$ 1,140	$ 32	$ 46