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12. Employee Benefits (Details - Weighted average assumptions)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Weighted average assumptions used to determine benefit obligations    
Discount rate 4.11% 3.50%
Weighted average assumptions used to determine net periodic benefit cost    
Discount rate 3.50% 4.05%
Expected return on plan assets 7.25% 7.25%