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8. Stock Plans (Details Narrative) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock compensation plan, total intrinsic values of options outstanding $ 8,800 $ 6,300  
Stock compensation plan, total intrinsic values of options exercisable 8,800 6,300  
Fair value restricted stock awards vested 1,086 1,372 $ 633
Stock compensation plan, total intrinsic value of unvested restricted stock 6,046    
Stock-based compensation expense 1,841 2,209 1,586
Stock-based compensation expense, total tax benefit recognized 644 773 555
General And Administrative Expense [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense $ 1,841 $ 2,209 $ 1,586
2006 Equity Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock compensation plan, remaining number of common stock shares reserved 52,936    
Deferred Compensation Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock compensation plan, remaining number of common stock shares reserved 1,583    
Director Stock Purchase Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock compensation plan, remaining number of common stock shares reserved 1,126