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INVESTMENTS
 12 Months Ended
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.

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2023

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2022

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Amortized

    

Market

    

Amortized

    

Market

​

    

Cost

    

Value

    

Cost

    

Value

​

​

(Dollars in thousands)

Marketable securities:

 

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Current

​

$

215

​

$

215

​

$

1,385

​

$

1,381

Due from one through five years

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3,518

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3,592

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3,977

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3,950

Due from six through ten years

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2,836

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2,830

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2,347

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2,455

Due from eleven through twenty years

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—

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—

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799

​

 

773

Total

​

$

6,569

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$

6,637

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$

8,508

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$

8,559

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The unrealized gains and losses on marketable securities at December 31, 2023 and 2022 were as follows:

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2023

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2022

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Unrealized

    

Unrealized

    

Unrealized

    

Unrealized

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Gains

    

Losses

    

Gains

    

Losses

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(Dollars in thousands)

Marketable securities

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$

118

​

$

(50)

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$

145

​

$

(94)

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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.

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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.