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INVESTMENTS | 12 Months Ended
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Dec. 31, 2023
INVESTMENTS |
INVESTMENTS | 4. INVESTMENTS Below is a summary of the amortized cost and estimated market values of our marketable securities as of December 31, 2023 and 2022. The estimated market values provided are Level 2 valuations as defined by ASC 820. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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
​ The unrealized gains and losses on marketable securities at December 31, 2023 and 2022 were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2023 | ​ | 2022
​ |  | Unrealized |  | Unrealized |  | Unrealized |  | Unrealized
​ |  | Gains |  | Losses |  | Gains |  | Losses
​ | ​ | (Dollars in thousands)
Marketable securities | ​ | $ | 118 | ​ | $ | (50) | ​ | $ | 145 | ​ | $ | (94)
​ At each reporting date, we review our investments to determine whether a decline in fair value below the amortized cost basis is other-than-temporary. To determine whether a decline in value is other-than-temporary, we consider all available evidence, including our overall financial condition, the severity and duration of the decline in fair value, and our intent and ability to hold the investment for a reasonable period of time sufficient for any forecasted recovery. If a decline in value is deemed other-than-temporary, we record a reduction in the carrying value to the estimated fair value. We reviewed our portfolio of investments as of December 31, 2023 and 2022 and determined that no other-than-temporary market value impairment exists. ​ At December 31, 2022, we also had $0.1 million of cash invested in highly liquid taxable bond funds. These investments, which were classified as trading securities and reported at fair value, were liquidated in 2023. There were no significant gains or losses on these investments in 2023 or 2022.

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//320/tableOfContent Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-10 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6B -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-6B Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6B -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-6B Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1403 -Paragraph (b) -Publisher SEC Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//946-320/tableOfContent Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 940 -SubTopic 320 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//940-320/tableOfContent Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 320 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//942-320/tableOfContent + Details
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