Investments

3 Months Ended

Mar. 31, 2024

Investments

Investments

4.    Investments

As noted in our Annual Report on Form 10-K for the year ended December 31, 2023, all 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 March 31, 2024, and December 31, 2023.

	March 31, 2024				December 31, 2023
	Amortized		Market		Amortized		Market
	Cost		Value		Cost		Value
	(Dollars in thousands)
Marketable securities:
Current	$	—	$	—	$	215	$	215
Due from one through five years		3,524		3,567		3,518		3,592
Due from six through ten years		2,836		2,800		2,836		2,830
Total	$	6,360	$	6,367	$	6,569	$	6,637

The unrealized gains and losses on marketable securities at March 31, 2024, and at December 31, 2023, were as follows:

	March 31, 2024				December 31, 2023
	Unrealized		Unrealized		Unrealized		Unrealized
	Gains		Losses		Gains		Losses
	(Dollars in thousands)
Marketable securities	$	99	$	(92)	$	118	$	(50)

The estimated market values provided are Level 2 valuations as defined by ASC 820, Fair Value Measurements and Disclosures. We reviewed our portfolio of investments as of March 31, 2024, and determined that no other-than-temporary market value impairment exists.