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Significant Accounting Policies - Stock Transactions - Stock Option Plans (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]          
Options Outstanding, beginning shares     475,396    
Options granted, shares 0 0 89,000 40,000  
Options exercised, shares (18,525) 0 (18,525) 0  
Options forfeited, shares     0    
Options expired, shares     0    
Options Outstanding, ending shares 545,871   545,871   475,396
Shares Exercisable 392,042   392,042    
Weighted average exercise price, Options Outstanding, beginning (in dollars per share)     $ 7.09    
Weighted average exercise price, Options granted (in dollars per share) $ 0.00 $ 0.00 11.06 $ 9.12  
Weighted average exercise price, Options exercised (in dollars per share)     5.65    
Weighted average exercise price, Options forfeited (in dollars per share)     0    
Weighted average exercise price, Options expired (in dollars per share)     0    
Weighted average exercise price, Options Outstanding, ending (in dollars per share) 7.79   7.79   $ 7.09
Weighted average exercise price, Options Exercisable (in dollars per share) $ 6.81   $ 6.81    
Weighted average remaining contractual life , Options Outstanding     5 years 4 months 24 days   5 years 1 month 6 days
Weighted average remaining contractual life, Options exercisable     3 years 10 months 24 days    
Aggregate intrinsic value: Options Outstanding $ 2,685,821   $ 2,685,821   $ 2,562,175
Aggregate intrinsic value, Options exercisable $ 2,312,616   $ 2,312,616