Other Income (Expenses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Other Income and Expenses [Abstract]
Interest and investment income	$ 324	$ 436	$ 696
Income tax expense	(738)	9	(819)
Other Nonoperating Expense	(4)
Other non-operating income		2	1
Total other income (expense)	$ (418)	$ 447	$ (122)