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(11) Employee Benefits (Details - Reconciliation) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Retirement Benefits [Abstract]      
Projected benefit obligation, beginning of year $ 22,280 $ 24,678  
Projected benefit obligation, beginning of year 579 553 $ 693
Assumption changes (5,450) (1,074)  
Actuarial (gain) loss 85 (222)  
Settlements (716) (865)  
Benefits paid (826) (790)  
Projected benefit obligation, end of year 15,952 22,280 24,678
Fair value of plan assets, beginning of year 26,098 18,165  
Return on assets (5,702) 8,703  
Employer contribution 0 1,124  
Expenses (86) (239)  
Settlements (716) (865)  
Benefits paid (826) (790)  
Fair value of plan assets, end of year 18,768 26,098 $ 18,165
Funded Status at end of year $ 2,816 $ 3,818