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Marketable securities | 12 Months Ended
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Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract] |
Marketable securities | Note 3 – Marketable securities: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Amortized |  | Unrealized
​ |  | Market value |  | cost basis |  | loss, net
​ | ​ | (In thousands)
December 31, 2023: |  | ​ |  |  | ​ |  |  | ​ |
Current assets | ​ | $ | 35,354 | ​ | $ | 35,359 | ​ | $ | (5)
​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​
December 31, 2024: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Current assets | ​ | $ | — | ​ | $ | — | ​ | $ | —
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ The marketable securities we held at December 31, 2023 consisted of investments in debt securities. The fair value of our marketable securities is generally determined using Level 2 inputs because although these securities are traded, in many cases the market is not active and the year-end valuation is generally based on the last trade of the year, which may be several days prior to year-end.

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