Employee Benefits (Details - Reconciliation) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Retirement Benefits [Abstract]
Projected benefit obligation, beginning of year	$ 15,952	$ 22,280
Interest cost	753	579	$ 553
Assumption changes	(3)	(5,450)
Actuarial (gain) loss	(271)	85
Settlements	0	(716)
Benefits paid	(954)	(826)
Projected benefit obligation, end of year	15,477	15,952	22,280
Fair value of plan assets, beginning of year	18,768	26,098
Return on assets	2,347	(5,702)
Employer contribution	0	0
Expenses	(113)	(86)
Settlements	0	(716)
Benefits paid	(954)	(826)
Fair value of plan assets, end of year	20,048	18,768	$ 26,098
Funded Status at end of year	$ 4,571	$ 2,816