Investments, Debt and Equity Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 36,669	$ 25,800
Gross unrealized gains	411	84
Gross unrealized loss	18	366
Fair value (net carrying amount)	37,062	25,518
Marketable equity securities	12,102	18,110
Less than one year	17,860
One year through five years	18,809
Six years through ten years	0
After ten years	0
Total	36,669
Less than one year		18,100
One year through five years		18,962
Six years through ten years		0
After ten years		0
Total		37,062
Quoted prices in active markets, (level 1) | Fair value measurements, recurring [Member]
Debt Securities, Available-for-sale [Line Items]
Fair value (net carrying amount)		25,518
Marketable equity securities	12,102	18,110
United States Government and agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	36,409	25,485
Gross unrealized gains	411	84
Gross unrealized loss	18	315
Fair value (net carrying amount)	36,802	25,254
United States Government and agency securities | Quoted prices in active markets, (level 1) | Fair value measurements, recurring [Member]
Debt Securities, Available-for-sale [Line Items]
Fair value (net carrying amount)	36,802	25,254
Corporate notes and bonds
Debt Securities, Available-for-sale [Line Items]
Amortized cost	260	315
Gross unrealized gains	0	0
Gross unrealized loss	0	51
Fair value (net carrying amount)	260	264
Corporate notes and bonds | Quoted prices in active markets, (level 1) | Fair value measurements, recurring [Member]
Debt Securities, Available-for-sale [Line Items]
Fair value (net carrying amount)	$ 260	$ 264