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INVESTMENTS (Tables) | 12 Months Ended
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Dec. 31, 2023
INVESTMENTS |
Schedule of marketable securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2023 | ​ | 2022
​ |  | Amortized |  | Market |  | Amortized |  | Market
​ |  | Cost |  | Value |  | Cost |  | Value
​ | ​ | (Dollars in thousands)
Marketable securities: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Current | ​ | $ | 215 | ​ | $ | 215 | ​ | $ | 1,385 | ​ | $ | 1,381
Due from one through five years | ​ |  | 3,518 | ​ |  | 3,592 | ​ |  | 3,977 | ​ |  | 3,950
Due from six through ten years | ​ |  | 2,836 | ​ |  | 2,830 | ​ |  | 2,347 | ​ |  | 2,455
Due from eleven through twenty years | ​ |  | — | ​ |  | — | ​ |  | 799 | ​ |  | 773
Total | ​ | $ | 6,569 | ​ | $ | 6,637 | ​ | $ | 8,508 | ​ | $ | 8,559
Schedule of unrealized gains and losses on marketable securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2023 | ​ | 2022
​ |  | Unrealized |  | Unrealized |  | Unrealized |  | Unrealized
​ |  | Gains |  | Losses |  | Gains |  | Losses
​ | ​ | (Dollars in thousands)
Marketable securities | ​ | $ | 118 | ​ | $ | (50) | ​ | $ | 145 | ​ | $ | (94)

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