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12. Employee Benefits (Details - Amounts recognized) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Amounts recognized on Consolidated Balance Sheet      
Other assets $ 0 $ 0 $ 0
Other liabilities (6,116) (5,272) (5,011)
Net amount recognized (6,116) (5,272) (5,011)
Amounts recognized in accumulated other comprehensive loss consists of:      
Net loss 11,350 10,618 10,592
Unrecognized transition asset 0 0 0
Net amount recognized 11,350 10,618 10,592
Components of net periodic benefit cost      
Interest Cost 855 882 843
Expected return on assets (1,149) (1,199) (1,508)
Amortization of transition asset 0 0 0
Amortization of net loss 405 553 349
Net periodic benefit cost 111 236 (316)
Settlement (gain)/loss 0 0 0
Total 111 236 (316)
Benefit Obligation Recognized in Other Comprehensive Loss (Income)      
Net loss (gain) 732 25 2,615
Prior service cost (credit) 0 0 0
Amortization of prior service cost 0 0 0
Net amount recognized in other comprehensive loss (income) $ 732 $ 25 $ 2,615