Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021
Balance at beginning of year		$ 265	$ 265
Additions charged (credited) to costs and expenses		32	36
Additions charged to other accounts		0	0
Deductions (recoveries)	[1]	37	36
Balance at ending of year		260	265
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member]
Balance at beginning of year		2,351	2,269
Additions charged (credited) to costs and expenses	[2]	137	82
Additions charged to other accounts		0	0
Deductions (recoveries)		0	0
Balance at ending of year		$ 2,488	$ 2,351

[1] Accounts receivable written-off as uncollectible, net of recoveries.

[2] Change in valuation allowance primarily for deferred tax assets when it is more likely than not that the deferred tax assets will not be realized.