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12. Employee Benefits (Details - Amounts recognized) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Amounts recognized on Consolidated Balance Sheet      
Other assets $ 0 $ 0 $ 0
Other liabilities (5,717) (6,116) (5,272)
Net amount recognized (5,717) (6,116) (5,272)
Amounts recognized in accumulated other comprehensive loss consists of:      
Net loss 11,896 11,350 10,618
Unrecognized transition asset 0 0 0
Net amount recognized 11,896 11,350 10,618
Components of net periodic benefit cost      
Interest Cost 775 855 882
Expected return on assets (1,163) (1,149) (1,199)
Amortization of transition asset 0 0 0
Amortization of net loss 443 405 553
Net periodic benefit cost 55 111 236
Settlement (gain)/loss 0 0 0
Total 55 111 236
Benefit Obligation Recognized in Other Comprehensive Loss (Income)      
Net loss (gain) 545 732 25
Prior service cost (credit) 0 0 0
Amortization of prior service cost 0 0 0
Net amount recognized in other comprehensive loss (income) $ 545 $ 732 $ 25