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7. Shareholders' Equity (Details Narrative) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Repurchase of common stock, value $ (12,346) $ (10,468) $ (5,926)
Proceeds from exercises $ 1,085 $ 706 $ 1,726
Weighted average exercise price of stock options granted $ 1.32 $ 1.38 $ 2.41
Voliatility assumptions, minimum 35.00% 44.00% 47.00%
Voliatility assumptions, maximum 37.00% 51.00% 51.00%
Stock-based compensation $ 5,715 $ 5,553 $ 5,024
Unrecognized stock-based compensation costs $ 5,800    
Weighted-average period for unrecognized costs 1 year 10 months 24 days    
Intrinsic value options outstanding $ 10,400 17,800  
Intrinsic value of options exercisable 9,500 14,200  
Intrinsic value of options exercised 1,900 $ 1,300  
Proceeds from options exercised 1,100    
Tax benefit from options exercised $ 178    
Warrants outstanding 2,000,000    
Common Stock [Member]      
Repurchase of common stock, shares 2,745,493    
Average price per share of common stock repurchased (in dollars per share) $ 4.49    
Common Stock [Member] | Open Market [Member]      
Repurchase of common stock, shares 2,693,562    
Repurchase of common stock, value $ 12,100    
Common Stock [Member] | Net Exercises of Outstanding Options and Warrants [Member]      
Repurchase of common stock, shares 51,931    
Proceeds from exercises $ 241    
Authorizations prior to December 31, 2016 [Member] | Common Stock [Member]      
Amount remaining of stock repurchase authorized amount 4,700    
No expiration [Member] | Common Stock [Member]      
Amount remaining of stock repurchase authorized amount $ 12,600    
2006 Plan [Member]      
Shares available for grant 2,500,000