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Stock Options (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Apr. 05, 2012
Stock options under 2012 Plan          
Stock option details          
Shares available for future grants 26,876   26,876   800,000
Maximum exercisable period for options granted     10 years    
Stock option activity          
Options outstanding at the beginning of the period (in shares)     788,977    
Plus: Options granted (in shares)     11,500    
Less:          
Options exercised (in shares)     47,175    
Options forfeited (in shares)     29,176    
Options outstanding at the end of the period (in shares) 724,126   724,126    
Options fully vested and exercisable at the end of the period (in shares) 369,795   369,795    
Stock Options, Weighted average exercise price          
Options outstanding at the beginning, weighted average exercise price (in dollars per share)     $ 25.91    
Plus: Options granted, weighted average exercise price (in dollars per share)     36.59    
Less:          
Options exercised, weighted average exercise price (in dollars per share)     18.52    
Options forfeited, weighted average exercise price (in dollars per share)     27.11    
Options outstanding at the end, weighted average exercise price (in dollars per share) $ 26.51   26.51    
Options fully vested and exercisable at the end, weighted average exercise price (in dollars per share) $ 21.07   $ 21.07    
Stock Options, Weighted average remaining contractual term (years)          
Options outstanding at the end, weighted average remaining contractual term (years)     5 years 9 months 18 days    
Options fully vested and exercisable at the end, weighted average remaining contractual term (years)     4 years 2 months 26 days    
Stock Options, Aggregate intrinsic value          
Options outstanding at the end, aggregate intrinsic value $ 8,234   $ 8,234    
Options fully vested and exercisable at the end, aggregate intrinsic value 6,159   6,159    
Stock-based compensation expense 239 $ 286 504 $ 470  
Stock-based compensation cost, unrecognized, related to non-vested options $ 2,336   $ 2,336    
Stock-based compensation cost, unrecognized, related to non-vested options, weighted-average period of recognition     1 year 10 months 24 days    
Incentive stock options granted to 10% shareholders          
Stock option details          
Maximum exercisable period for options granted     5 years