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Marketable Securities | 12 Months Ended
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Dec. 31, 2022
Investments Debt And Equity Securities [Abstract] |
Marketable Securities | Note 6 – Marketable securities: Our marketable securities consist of investments in the publicly-traded shares of related parties: Valhi, NL and CompX International Inc. NL owns the majority of CompX’s outstanding common stock. All of our marketable securities are accounted for as available-for-sale securities, which are carried at fair value using quoted market prices in active markets for each marketable security and represent a Level 1 input within the fair value hierarchy. Unrealized gains or losses on equity securities are recognized in Other income (expense) - Marketable equity securities on our Consolidated Statements of Income. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Fair value |  | ​ | ​ |  | ​ | ​ |  | ​ | ​
​ | ​ | measurement | ​ | Market | ​ | Cost | ​ | Unrealized
Marketable security |  | level |  | value |  | basis |  | gain (loss)
​ | ​ | ​ |  | (In millions)
December 31, 2021: |  |  |  | ​ |  |  | ​ |  |  | ​ |
Valhi common stock |  | 1 | ​ | $ | 4.1 | ​ | $ | 3.2 | ​ | $ | .9
NL and CompX common stocks |  | 1 | ​ |  | .1 | ​ |  | .1 | ​ |  | -
Total | ​ | ​ | ​ | $ | 4.2 | ​ | $ | 3.3 | ​ | $ | .9
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, 2022: | ​ | ​ | ​ |  |  | ​ |  |  | ​ |  |
Valhi common stock |  | 1 | ​ | $ | 3.2 | ​ | $ | 3.2 | ​ | $ | -
​ At December 31, 2021 and 2022, we held approximately 144,000 shares of Valhi’s common stock. The per share quoted market price of Valhi’s common stock was $28.75 and $22.00, at December 31, 2021 and 2022, respectively. We held a nominal number of shares of CompX and NL common stocks at December 31, 2021. During the second quarter of 2022 we sold all of our shares of NL and CompX common stock to the respective issuer in two separate private transactions that were approved in advance by our independent directors (using a 10-day trailing average price per share to determine the purchase price) for an aggregate sales price of $.1 million. The Valhi common stock we own is subject to the restrictions on resale pursuant to certain provisions of the Securities and Exchange Commission (SEC) Rule 144. In addition, as a majority-owned subsidiary of Valhi we cannot vote our shares of Valhi common stock under Delaware General Corporation Law, but we do receive dividends from Valhi on these shares, when declared and paid.

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI https://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI https://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI https://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI https://asc.fasb.org/subtopic&trid=2176304 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1403 -Paragraph (b) + Details
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