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Marketable securities | 12 Months Ended
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Dec. 31, 2023
Marketable securities |
Marketable securities | Note 6 – Marketable securities: Our marketable securities consist of an investment in the publicly-traded shares of Valhi, a related party. 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 Operations. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Fair value |  | ​ | ​ |  | ​ | ​ |  | ​ | ​
​ | ​ | measurement | ​ | Market | ​ | Cost | ​ | Unrealized
Marketable security |  | level |  | value |  | basis |  | loss
​ | ​ | ​ |  | (In millions)
December 31, 2022: |  |  |  | ​ |  |  | ​ |  |  | ​ |
Valhi common stock |  | 1 | ​ | $ | 3.2 | ​ | $ | 3.2 | ​ | $ | -
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, 2023: | ​ | ​ | ​ |  |  | ​ |  |  | ​ |  |
Valhi common stock |  | 1 | ​ | $ | 2.2 | ​ | $ | 3.2 | ​ | $ | (1.0)
​ At December 31, 2022 and 2023, we held approximately 144,000 shares of Valhi’s common stock. The per share quoted market price of Valhi’s common stock was $22.00 and $15.19, at December 31, 2022 and 2023, respectively. 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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