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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Cash flows from operating activities:    
Net income $ 2,376 $ 15,768
Depreciation and amortization 1,868 1,846
Deferred income taxes (84) 2,149
Equity in earnings of Kronos Worldwide, Inc. (2,714) (8,449)
Dividends received from Kronos Worldwide, Inc. 3,522 13,384
Marketable equity securities 8,659 (3,162)
Benefit plan expense greater than cash funding 621 343
Noncash interest income 0 (752)
Noncash interest expense 157 267
Other, net 268 52
Change in assets and liabilities:    
Accounts and other receivables, net 6,757 2,050
Inventories, net (4,664) 3,201
Prepaid expenses and other 474 372
Accounts payable and accrued liabilities (1,155) (1,637)
Accounts with affiliates (73) 29
Accrued environmental remediation and related costs (55,977) 684
Other noncurrent assets and liabilities, net (223) (3,867)
Net cash provided by (used in) operating activities (40,188) 22,278
Cash flows from investing activities:    
Capital expenditures (2,165) (730)
Proceeds from maturities of marketable securities   42,000
Note receivable from affiliate:    
Collections 6,400 13,400
Loans (6,000) (12,000)
Other 10  
Net cash provided by (used in) investing activities (1,755) 42,670
Cash flows from financing activities:    
Dividends paid (8,794) (7,814)
Dividends paid to noncontrolling interests in subsidiary (939) (936)
Net cash used in financing activities (9,733) (8,750)
Cash and cash equivalents and restricted cash and cash equivalents - net change from:    
Operating, investing and financing activities (51,676) 56,198
Balance at beginning of year 184,190 141,382
Balance at end of period 132,514 197,580
Cash paid for:    
Interest 509 26
Income taxes, net 93  
Noncash investing activities -    
Change in accruals for capital expenditures $ (424) $ (10)