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CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Income Statement [Abstract]        
Net sales $ 39,950 $ 33,667 $ 120,588 $ 107,525
Cost of sales 28,921 24,199 84,506 77,225
Gross margin 11,029 9,468 36,082 30,300
Selling, general and administrative expense 6,268 6,119 19,132 18,155
Insurance Recoveries   1,100   1,317
Corporate expense 2,910 2,413 9,150 9,279
Income from operations 1,851 2,036 7,800 4,183
Equity in earnings (losses) of Kronos Worldwide, Inc. (11,318) 21,982 (8,604) 30,431
Other income (expense):        
Interest and dividend income 2,076 2,716 5,618 7,945
Marketable equity securities (456) 18,613 (9,115) 21,775
Other components of net periodic pension and OPEB cost (285) (318) (855) (954)
Interest expense (90) (147) (756) (440)
Income (loss) before income taxes (8,222) 44,882 (5,912) 62,940
Income tax expense (benefit) (854) 8,508 (920) 10,798
Net income (loss) (7,368) 36,374 (4,992) 52,142
Noncontrolling interest in net income of subsidiary 503 364 1,857 1,458
Net income (loss) attributable to NL stockholders $ (7,871) $ 36,010 $ (6,849) $ 50,684
Amounts attributable to NL stockholders:        
Net income (loss) per basic share $ (0.16) $ 0.74 $ (0.14) $ 1.04
Net income (loss) per diluted share $ (0.16) $ 0.74 $ (0.14) $ 1.04
Weighted average shares outstanding - basic 48,863 48,848 48,855 48,841
Weighted average shares outstanding - diluted 48,863 48,848 48,855 48,841