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Segment information - Differences Between Segment Profit and Amounts Included in Net Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Net sales $ 39,950 $ 33,667 $ 120,588 $ 107,525
Segment profit (8,222) 44,882 (5,912) 62,940
Insurance recoveries   1,100   1,317
Corporate expenses (2,910) (2,413) (9,150) (9,279)
Equity in earnings (losses) of Kronos Worldwide, Inc. (11,318) 21,982 (8,604) 30,431
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 tax benefit (expense) 854 (8,508) 920 (10,798)
Net income (loss) (7,368) 36,374 $ (4,992) 52,142
Number of reportable segments not disclosed     true  
Single reportable segment        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Net sales 39,950 33,667 $ 120,588 107,525
Segment profit 4,761 3,349 16,950 12,145
Insurance recoveries   1,100   1,317
Corporate expenses (2,910) (2,413) (9,150) (9,279)
Equity in earnings (losses) of Kronos Worldwide, Inc. (11,318) 21,982 (8,604) 30,431
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 tax benefit (expense) 854 (8,508) 920 (10,798)
Net income (loss) $ (7,368) $ 36,374 $ (4,992) $ 52,142