CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
CONDENSED CONSOLIDATED STATEMENTS OF INCOME
Net sales	$ 41,675	$ 36,253	$ 83,725	$ 72,177
Cost of sales	28,046	24,947	58,016	49,836
Gross margin	13,629	11,306	25,709	22,341
Selling, general and administrative expense	5,884	5,548	11,658	10,766
Other operating income (expense):
Corporate expense	(3,540)	(2,871)	(5,976)	(4,716)
Income from operations	4,205	2,887	8,075	6,859
Equity in earnings of Kronos Worldwide, Inc.	13,991	7,816	31,524	13,784
Other income (expense):
Interest and dividend income	567	423	876	863
Marketable equity securities	19,200	4,575	19,871	10,935
Other components of net periodic pension and OPEB cost	(223)	(196)	(446)	(267)
Interest expense	(248)	(299)	(494)	(597)
Income before income taxes	37,492	15,206	59,406	31,577
Income tax expense	6,435	1,901	9,140	4,406
Net income	31,057	13,305	50,266	27,171
Noncontrolling interest in net income of subsidiary	805	608	1,457	1,217
Net income attributable to NL stockholders	$ 30,252	$ 12,697	$ 48,809	$ 25,954
Amounts attributable to NL stockholders:
Net income per basic share	$ 0.62	$ 0.26	$ 1.00	$ 0.53
Net income per diluted share	$ 0.62	$ 0.26	$ 1.00	$ 0.53
Weighted average shares outstanding - basic	48,809	48,795	48,806	48,792
Weighted average shares outstanding - diluted	48,809	48,795	48,806	48,792