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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Statement [Abstract]      
Net sales $ 114,537 $ 124,243 $ 118,217
Cost of sales 81,689 85,280 79,946
Gross margin 32,848 38,963 38,271
Selling, general and administrative expense 21,031 21,297 20,460
Other operating income (expense):      
Insurance recoveries 81 5,138 1,298
Other income, net 18 7,444 644
Litigation settlement expense, net   (19,266) (62,000)
Corporate expense (9,559) (12,591) (18,419)
Income (loss) from operations 2,357 (1,609) (60,666)
Equity in earnings of Kronos Worldwide, Inc. 19,437 26,470 62,316
Other income (expense):      
Interest and dividend income 2,599 6,672 5,069
Marketable equity securities (8,671) (863) (60,941)
Other components of net periodic pension and OPEB cost (784) (1,375) (115)
Interest expense (1,350) (681) (37)
Income (loss) before income taxes 13,588 28,614 (54,374)
Income tax expense (benefit) (2,515) 579 (15,361)
Net income (loss) 16,103 28,035 (39,013)
Noncontrolling interest in net income of subsidiary 1,423 2,191 2,004
Net income (loss) attributable to NL stockholders $ 14,680 $ 25,844 $ (41,017)
Amounts attributable to NL stockholders:      
Basic and diluted net income (loss) per share $ 0.30 $ 0.53 $ (0.84)
Weighted average shares used in the calculation of net income (loss) per share 48,776 48,745 48,727