Short-term Investment Securities (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Short-term investment securities	$ 112,501,000	$ 107,115,000
Accumulated other comprehensive income (loss)	(67,000)	(596,000)
Debt Securities, Available For Sale
Debt Securities, Available-for-sale [Line Items]
Short-term investment securities	$ 112,500,000	$ 107,100,000
Weighted-average fixed rate	4.50%	1.00%	0.10%
Unrealized gain (loss) on investment securities, net of deferred taxes	$ 298,000	$ (224,000)
Realized gain	0	0
Accumulated other comprehensive income (loss)	$ 32,000	$ (267,000)