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12. Employee Benefits (Details - Amounts recognized) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Amounts recognized on Consolidated Balance Sheet      
Other assets $ 0 $ 0 $ 0
Other liabilities (7,087) (5,717) (6,116)
Net amount recognized (7,087) (5,717) (6,116)
Amounts recognized in accumulated other comprehensive loss consists of:      
Net loss 13,092 11,896 11,350
Unrecognized transition asset 0 0 0
Net amount recognized 13,092 11,896 11,350
Components of net periodic benefit cost      
Interest Cost 808 775 855
Expected return on assets (1,012) (1,163) (1,149)
Amortization of transition asset 0 0 0
Amortization of net loss 376 443 405
Net periodic benefit cost 172 55 111
Settlement (gain)/loss 0 0 0
Total 172 55 111
Benefit Obligation Recognized in Other Comprehensive Loss (Income)      
Net loss (gain) 1,197 545 732
Prior service cost (credit) 0 0 0
Amortization of prior service cost 0 0 0
Net amount recognized in other comprehensive loss (income) $ 1,197 $ 545 $ 732