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12. Employee Benefits (Details - Fair value of plan assets) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Fair value of plan assets $ 16,446 $ 16,243 $ 16,374
Level 1 [Member]      
Fair value of plan assets [1] 3,633 4,581  
Level 2 [Member]      
Fair value of plan assets [2] 12,813 11,662  
Level 3 [Member]      
Fair value of plan assets [3] 0  
Company Common Stock [Member]      
Fair value of plan assets 3,633 4,581  
Company Common Stock [Member] | Level 1 [Member]      
Fair value of plan assets [1] 3,633 4,581  
Company Common Stock [Member] | Level 2 [Member]      
Fair value of plan assets [2] 0  
Company Common Stock [Member] | Level 3 [Member]      
Fair value of plan assets [3] 0  
Large Cap Value [Member]      
Fair value of plan assets 2,324 2,238  
Large Cap Value [Member] | Level 1 [Member]      
Fair value of plan assets [1] 0  
Large Cap Value [Member] | Level 2 [Member]      
Fair value of plan assets [2] 2,324 2,238  
Large Cap Value [Member] | Level 3 [Member]      
Fair value of plan assets [3] 0  
Mid Cap Index [Member]      
Fair value of plan assets 654 625  
Mid Cap Index [Member] | Level 1 [Member]      
Fair value of plan assets [1] 0  
Mid Cap Index [Member] | Level 2 [Member]      
Fair value of plan assets [2] 654 625  
Mid Cap Index [Member] | Level 3 [Member]      
Fair value of plan assets [3] 0  
Small Cap Growth [Member]      
Fair value of plan assets 657 621  
Small Cap Growth [Member] | Level 1 [Member]      
Fair value of plan assets [1] 0  
Small Cap Growth [Member] | Level 2 [Member]      
Fair value of plan assets [2] 657 621  
Small Cap Growth [Member] | Level 3 [Member]      
Fair value of plan assets [3] 0  
Small Cap Value [Member]      
Fair value of plan assets 647 687  
Small Cap Value [Member] | Level 1 [Member]      
Fair value of plan assets [1] 0  
Small Cap Value [Member] | Level 2 [Member]      
Fair value of plan assets [2] 647 687  
Small Cap Value [Member] | Level 3 [Member]      
Fair value of plan assets [3] 0  
Large Cap Blend [Member]      
Fair value of plan assets 661    
Large Cap Blend [Member] | Level 1 [Member]      
Fair value of plan assets [1] 0    
Large Cap Blend [Member] | Level 2 [Member]      
Fair value of plan assets [2] 661    
Large Cap Blend [Member] | Level 3 [Member]      
Fair value of plan assets [3] 0    
Growth [Member]      
Fair value of plan assets 2,313 1,980  
Growth [Member] | Level 1 [Member]      
Fair value of plan assets [1] 0  
Growth [Member] | Level 2 [Member]      
Fair value of plan assets [2] 2,313 1,980  
Growth [Member] | Level 3 [Member]      
Fair value of plan assets [3] 0  
International Growth [Member]      
Fair value of plan assets 2,683 2,392  
International Growth [Member] | Level 1 [Member]      
Fair value of plan assets [1] 0  
International Growth [Member] | Level 2 [Member]      
Fair value of plan assets [2] 2,683 2,392  
International Growth [Member] | Level 3 [Member]      
Fair value of plan assets [3] 0  
Core Bond [Member]      
Fair value of plan assets 1,870 1,644  
Core Bond [Member] | Level 1 [Member]      
Fair value of plan assets [1] 0  
Core Bond [Member] | Level 2 [Member]      
Fair value of plan assets [2] 1,870 1,644  
Core Bond [Member] | Level 3 [Member]      
Fair value of plan assets [3] 0  
High Yield [Member]      
Fair value of plan assets 373 356  
High Yield [Member] | Level 1 [Member]      
Fair value of plan assets [1] 0  
High Yield [Member] | Level 2 [Member]      
Fair value of plan assets [2] 354 356  
High Yield [Member] | Level 3 [Member]      
Fair value of plan assets [3] 0  
Inflation Protected Bond [Member]      
Fair value of plan assets 505 433  
Inflation Protected Bond [Member] | Level 1 [Member]      
Fair value of plan assets [1] 0  
Inflation Protected Bond [Member] | Level 2 [Member]      
Fair value of plan assets [2] 505 433  
Inflation Protected Bond [Member] | Level 3 [Member]      
Fair value of plan assets [3] 0    
Money Market [Member]      
Fair value of plan assets 126 10  
Money Market [Member] | Level 1 [Member]      
Fair value of plan assets [1] 0  
Money Market [Member] | Level 2 [Member]      
Fair value of plan assets [2] 126 10  
Money Market [Member] | Level 3 [Member]      
Fair value of plan assets [3] $ 0  
Focus Value [Member]      
Fair value of plan assets   676  
Focus Value [Member] | Level 1 [Member]      
Fair value of plan assets [1]    
Focus Value [Member] | Level 2 [Member]      
Fair value of plan assets [2]   676  
Focus Value [Member] | Level 3 [Member]      
Fair value of plan assets [3]    
[1] Company common stock is classified as level 1 and valued using quoted prices in active markets for identical assets.
[2] All other plan assets in stock, bond and money market funds are classified as level 2 and valued using significant observable inputs.
[3] There are no plan assets classified as level 3 in the fair value hierarchy as a result of having significant unobservable inputs.