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Investments | 3 Months Ended
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Mar. 31, 2024
Investments |
Investments | 4. Investments As noted in our Annual Report on Form 10-K for the year ended December 31, 2023, all our marketable securities are classified as held-to-maturity securities and reported at amortized cost pursuant to ASC 320, Investments – Debt and Equity Securities, as we have the intent and ability to hold all investments to maturity. Below is a summary of the amortized cost and estimated market values of our marketable securities as of March 31, 2024, and December 31, 2023. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2024 | ​ | December 31, 2023 | ​
​ |  | Amortized |  | Market |  | Amortized |  | Market |
​ |  | Cost |  | Value |  | Cost |  | Value |
​ | ​ | (Dollars in thousands) | ​
Marketable securities: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Current | ​ | $ | — | ​ | $ | — | ​ | $ | 215 | ​ | $ | 215 | ​
Due from one through five years | ​ |  | 3,524 | ​ |  | 3,567 | ​ |  | 3,518 | ​ |  | 3,592 | ​
Due from six through ten years | ​ |  | 2,836 | ​ |  | 2,800 | ​ |  | 2,836 | ​ |  | 2,830 | ​
Total | ​ | $ | 6,360 | ​ | $ | 6,367 | ​ | $ | 6,569 | ​ | $ | 6,637 | ​
​ The unrealized gains and losses on marketable securities at March 31, 2024, and at December 31, 2023, were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2024 | ​ | December 31, 2023 | ​
​ |  | Unrealized |  | Unrealized |  | Unrealized |  | Unrealized |
​ |  | Gains |  | Losses |  | Gains |  | Losses |
​ | ​ | (Dollars in thousands) | ​
Marketable securities | ​ | $ | 99 | ​ | $ | (92) | ​ | $ | 118 | ​ | $ | (50) | ​
​ The estimated market values provided are Level 2 valuations as defined by ASC 820, Fair Value Measurements and Disclosures. We reviewed our portfolio of investments as of March 31, 2024, and determined that no other-than-temporary market value impairment exists.

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