CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Current assets:
Cash and cash equivalents	$ 101,909	$ 110,615
Restricted cash and cash equivalents	3,125	3,123
Accounts and other receivables, net	18,989	13,801
Inventories, net	30,070	30,410
Prepaid expenses and other	1,768	1,954
Total current assets	155,861	159,903
Other assets:
Note receivable from affiliate	7,400	8,000
Marketable securities	17,128	14,433
Investment in Kronos Worldwide, Inc.	228,245	230,088
Goodwill	27,156	27,156
Operating lease right-of-use asset	1,014
Other assets, net	935	931
Total other assets	281,878	280,608
Property and equipment:
Land	5,390	5,390
Buildings	23,634	23,634
Equipment	78,137	78,021
Construction in progress	937	477
Property and equipment, gross	108,098	107,522
Less accumulated depreciation	84,645	83,813
Net property and equipment	23,453	23,709
Total assets	461,192	464,220
Current liabilities:
Accounts payable	3,239	2,697
Accrued and other current liabilities	8,172	15,021
Accrued environmental remediation and related costs	2,096	2,071
Payables to affiliates	1,121	791
Total current liabilities	14,628	20,580
Noncurrent liabilities:
Long-term debt from affiliate	500	500
Accrued environmental remediation and related costs	10,873	10,969
Deferred income taxes	55,435	54,103
Operating lease liability	926
Other	1,199	1,277
Total noncurrent liabilities	68,933	66,849
NL stockholders' equity:
Preferred stock
Common stock	6,107	6,107
Additional paid-in capital	299,349	299,349
Retained earnings	248,838	249,380
Accumulated other comprehensive loss	(194,965)	(196,067)
Total NL stockholders' equity	359,329	358,769
Noncontrolling interest in subsidiary	18,302	18,022
Total equity	377,631	376,791
Total liabilities and equity	461,192	464,220
Commitments and contingencies (Notes 12 and 14)