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INVESTMENTS | 12 Months Ended
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Dec. 31, 2022
INVESTMENTS |
INVESTMENTS | 5. INVESTMENTS Investments, at fair value At December 31, 2022 and 2021, we had $0.1 million and $8.1 million, respectively, 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 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 ASC 820. Marketable securities, at amortized cost We also invest in marketable securities. 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 our marketable securities as of December 31, 2022 and 2021. The estimated market values provided are Level 2 valuations as defined by ASC 820. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2022 | ​ | 2021
​ |  | Amortized |  | Market |  | Amortized |  | Market
​ |  | Cost |  | Value |  | Cost |  | Value
​ | ​ | (Dollars in thousands)
Marketable securities: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Current | ​ | $ | 1,385 | ​ | $ | 1,381 | ​ | $ | 219 | ​ | $ | 223
Due from one through five years | ​ |  | 3,977 | ​ |  | 3,950 | ​ |  | 6,503 | ​ |  | 6,805
Due from six through ten years | ​ |  | 2,347 | ​ |  | 2,455 | ​ |  | 2,479 | ​ |  | 2,790
Due from eleven through twenty years | ​ |  | 799 | ​ |  | 773 | ​ |  | 1,014 | ​ |  | 1,102
Total | ​ | $ | 8,508 | ​ | $ | 8,559 | ​ | $ | 10,215 | ​ | $ | 10,920
​ The unrealized gains and losses on marketable securities at December 31, 2022 and 2021 were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2022 | ​ | 2021
​ |  | Unrealized |  | Unrealized |  | Unrealized |  | Unrealized
​ |  | Gains |  | Losses |  | Gains |  | Losses
​ | ​ | (Dollars in thousands)
Marketable securities | ​ | $ | 145 | ​ | $ | (94) | ​ | $ | 705 | ​ | $ | —
​ 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, 2022 and 2021 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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