CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
CONDENSED CONSOLIDATED STATEMENTS OF INCOME
Net sales	$ 42,864	$ 34,556	$ 126,589	$ 106,733
Cost of sales	30,928	23,634	88,944	73,470
Gross margin	11,936	10,922	37,645	33,263
Selling, general and administrative expense	6,016	5,791	17,674	16,557
Other operating income (expense):
Corporate expense	(2,704)	(2,847)	(8,680)	(7,563)
Income from operations	3,216	2,284	11,291	9,143
Equity in earnings of Kronos Worldwide, Inc.	6,416	10,934	37,940	24,718
Other income (expense):
Interest and dividend income	1,081	387	1,957	1,250
Marketable equity securities	(24,171)	(1,198)	(4,300)	9,737
Other components of net periodic pension and OPEB cost	(223)	(196)	(669)	(463)
Interest expense	(251)	(299)	(745)	(896)
Income (loss) before income taxes	(13,932)	11,912	45,474	43,489
Income tax expense (benefit)	(5,576)	1,054	3,564	5,460
Net income (loss)	(8,356)	10,858	41,910	38,029
Noncontrolling interest in net income of subsidiary	548	545	2,005	1,762
Net income (loss) attributable to NL stockholders	$ (8,904)	$ 10,313	$ 39,905	$ 36,267
Amounts attributable to NL stockholders:
Net income (loss) per basic share	$ (0.18)	$ 0.21	$ 0.82	$ 0.74
Net income (loss) per diluted share	$ (0.18)	$ 0.21	$ 0.82	$ 0.74
Weighted average shares outstanding - basic	48,816	48,803	48,809	48,795
Weighted average shares outstanding - diluted	48,816	48,803	48,809	48,795