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Investments | 3 Months Ended
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Mar. 31, 2023
Investments |
Investments | 4. Investments Investments, at fair value At both March 31, 2023 and December 31, 2022, we had $0.1 million of cash invested in highly liquid taxable bond funds. We classify these investments as trading securities and report them at fair value. There were no significant unrealized gains or losses on these investments in the first quarters of 2023 and 2022. The fair value measurements of these investments are based on quoted market prices in active markets, and thus represent a Level 1 valuation as defined by Accounting Standards Codification (“ASC”) 820, Fair Value Measurements and Disclosures. Marketable securities, at amortized cost We also invest in marketable securities. As noted in our Annual Report on Form 10-K for the year ended December 31, 2022, all of 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 the Company's marketable securities as of March 31, 2023 and December 31, 2022. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2023 | ​ | December 31, 2022
​ |  | Amortized |  | Market |  | Amortized |  | Market
​ |  | Cost |  | Value |  | Cost |  | Value
​ | ​ | (Dollars in thousands)
Marketable securities: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Current | ​ | $ | 1,098 | ​ | $ | 1,098 | ​ | $ | 1,385 | ​ | $ | 1,381
Due from one through five years | ​ |  | 3,757 | ​ |  | 3,758 | ​ |  | 3,977 | ​ |  | 3,950
Due from six through ten years | ​ |  | 2,347 | ​ |  | 2,492 | ​ |  | 2,347 | ​ |  | 2,455
Due from eleven through twenty years | ​ |  | 799 | ​ |  | 796 | ​ |  | 799 | ​ |  | 773
Total | ​ | $ | 8,001 | ​ | $ | 8,144 | ​ | $ | 8,508 | ​ | $ | 8,559
​ The unrealized gains and losses on marketable securities at March 31, 2023, and at December 31, 2022, were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2023 | ​ | December 31, 2022
​ |  | Unrealized |  | Unrealized |  | Unrealized |  | Unrealized
​ |  | Gains |  | Losses |  | Gains |  | Losses
​ | ​ | (Dollars in thousands)
Marketable securities | ​ | $ | 181 | ​ | $ | (38) | ​ | $ | 145 | ​ | $ | (94)
​ The estimated market values provided are Level 2 valuations as defined by ASC 820. We reviewed our portfolio of investments as of March 31, 2023 and determined that no other-than-temporary market value impairment exists.

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI https://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI https://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI https://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI https://asc.fasb.org/subtopic&trid=2176304 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1403 -Paragraph (b) + Details
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