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INTANGIBLES | 12 Months Ended
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Dec. 31, 2023
INTANGIBLES [Abstract] |
INTANGIBLES | 4. INTANGIBLES Intangible assets consist of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Dollars in Thousands
​ | ​ | December 31, 2023
​ |  | ​ | ​ |  | Accumulated |  | Net Book
​ | ​ | Cost | ​ | Amortization | ​ | Value
Technology | ​ | $ | 18,990 | ​ | $ | 6,172 | ​ | $ | 12,818
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Dollars in Thousands
​ | ​ | December 31, 2022
​ |  | ​ | ​ |  | Accumulated |  | Net Book
​ | ​ | Cost | ​ | Amortization | ​ | Value
Technology | ​ | $ | 18,990 | ​ | $ | 5,222 | ​ | $ | 13,768
​
​ | ​ | ​ | ​
​ |  | Estimated Useful Life | ​
Technology |  | 20 | years
​ Amortization expense for intangible assets was $1.0 million during the years ended December 31, 2023 and 2022, respectively. Amortization expense for intangible assets is expected to be $1.0 million for each of the years ending December 31, 2024, 2025, 2026, 2027 and 2028, respectively.

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//350-30/tableOfContent + Details
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