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Marketable securities | 9 Months Ended
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Sep. 30, 2025
Marketable securities |
Marketable securities | Note 5 – Marketable securities: Our noncurrent marketable securities are equity securities and consist of our investment in the publicly-traded shares of our immediate parent company Valhi, Inc. Our shares of Valhi common stock are accounted for as available-for-sale securities, which are carried at fair value using quoted market prices in active markets and represent a Level 1 input within the fair value hierarchy, as defined by ASC Topic 820, Fair Value Measurements and Disclosures. We record any unrealized gains or losses on the securities in other income (expense) on our Condensed Consolidated Statements of Operations. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fair value | ​ | ​ | ​ | ​ | Cost or | ​ | ​ | ​
​ | ​ | measurement | ​ | Market | ​ | amortized | ​ | Unrealized
​ |  | level |  | value |  | cost |  | gain (loss), net
​ | ​ | ​ | ​ | (In thousands)
December 31, 2024 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Noncurrent assets - Valhi common stock |  | 1 | ​ | $ | 28,015 | ​ | $ | 24,347 | ​ | $ | 3,668
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
September 30, 2025 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Noncurrent assets - Valhi common stock | ​ | 1 | ​ | $ | 18,900 | ​ | $ | 24,347 | ​ | $ | (5,447)
​ At December 31, 2024 and September 30, 2025, we held approximately 1.2 million shares of common stock of our immediate parent company, Valhi, Inc. At December 31, 2024 and September 30, 2025, the quoted per share market price of Valhi common stock was $23.39 and $15.78, respectively. The Valhi common stock we own is subject to restrictions on resale pursuant to certain provisions of the 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 receive dividends from Valhi on these shares, when declared and paid.

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