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Investments | 3 Months Ended
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Mar. 31, 2022
Investments |
Investments | 5. Investments Investments, at fair value At March 31, 2022 and December 31, 2021, the Company had $0.1 million and $8.1 million, respectively, of cash invested in highly liquid taxable bond funds. The Company classifies these investments as trading securities and reports them at fair value. There were no significant unrealized gains or losses on these investments in the first quarters of 2022 and 2021. 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 The Company also invests in marketable securities. As noted in the Company’s Annual Report on Form 10-K for the year ended December 31, 2021, all of the Company’s marketable securities are classified as held-to-maturity securities and reported at amortized cost pursuant to ASC 320, Investments - Debt and Equity Securities, as the Company has 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, 2022, and December 31, 2021. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2022 | ​ | December 31, 2021
​ |  | Amortized |  | Market |  | Amortized |  | Market
​ |  | Cost |  | Value |  | Cost |  | Value
​ | ​ | (Dollars in thousands)
Municipal bonds: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Current | ​ | $ | 719 | ​ | $ | 725 | ​ | $ | 219 | ​ | $ | 223
Due from one through five years | ​ |  | 5,705 | ​ |  | 5,784 | ​ |  | 6,503 | ​ |  | 6,805
Due from six through ten years | ​ |  | 2,305 | ​ |  | 2,473 | ​ |  | 2,479 | ​ |  | 2,790
Due from eleven through twenty years | ​ |  | 1,013 | ​ |  | 1,044 | ​ |  | 1,014 | ​ |  | 1,102
Total | ​ | $ | 9,742 | ​ | $ | 10,026 | ​ | $ | 10,215 | ​ | $ | 10,920
​ The unrealized gains and losses on marketable securities at March 31, 2022, and at December 31, 2021, were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2022 | ​ | December 31, 2021
​ |  | Unrealized |  | Unrealized |  | Unrealized |  | Unrealized
​ |  | Gains |  | Losses |  | Gains |  | Losses
​ | ​ | (Dollars in thousands)
Municipal bonds | ​ | $ | 290 | ​ | $ | (6) | ​ | $ | 705 | ​ | $ | —
​ The estimated market values provided are level 2 valuations as defined by ASC 820. The Company reviewed its portfolio of investments as of March 31, 2022, 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 http://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 http://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 http://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 http://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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