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v3.25.1

Investments (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2025
Investments |
Schedule of marketable securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2025 | ​ | December 31, 2024
​ |  | Amortized |  | Market |  | Amortized |  | Market
​ |  | Cost |  | Value |  | Cost |  | Value
​ | ​ | (Dollars in thousands)
Marketable securities: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Current | ​ | $ | 856 | ​ | $ | 853 | ​ | $ | 852 | ​ | $ | 848
Due from one through five years | ​ |  | 3,189 | ​ |  | 3,184 | ​ |  | 2,692 | ​ |  | 2,677
Due from six through ten years | ​ |  | 2,343 | ​ |  | 2,243 | ​ |  | 2,837 | ​ |  | 2,749
Total | ​ | $ | 6,388 | ​ | $ | 6,280 | ​ | $ | 6,381 | ​ | $ | 6,274
Schedule of unrealized gains and losses on marketable securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2025 | ​ | December 31, 2024
​ |  | Unrealized |  | Unrealized |  | Unrealized |  | Unrealized
​ |  | Gains |  | Losses |  | Gains |  | Losses
​ | ​ | (Dollars in thousands)
Marketable securities | ​ | $ | 4 | ​ | $ | (112) | ​ | $ | 5 | ​ | $ | (112)

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