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Stock-Based Compensation (Details 1) - Stock Options [Member] - $ / shares
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Summary of the status of the stock option plan and changes      
Shares Outstanding at beginning of year 662,841 642,203 693,954
Shares Granted 93,200 110,950 109,500
Shares Exercised (105,630) (74,437) (152,751)
Shares Forfeited or expired (3,600) (15,875) (8,500)
Shares Outstanding at end of year 646,811 662,841 642,203
Shares options exercisable at year-end 404,851 419,766 399,256
Shares available for grant 270,090 359,690 454,765
Weighted average exercise price Outstanding at beginning of year $ 15.70 $ 11.77 $ 8.94
Weighted average exercise price Granted 43.32 35.34 23.65
Weighted average exercise price Exercised 8.51 9.48 7.19
Weighted average exercise price Forfeited or expired 40.03 23.49 15.69
Weighted average exercise price Outstanding at end of year 20.71 15.70 11.77
Weighted average exercise price, Options exercisable at year-end 12.58 9.20 7.62
Weighted average fair value of options granted during the year $ 16.83 $ 14.14 $ 10.96
Weighted Average Remaining Contractual Life, Outstanding at end of year 5 years 7 months 6 days 5 years 7 months 6 days 5 years 10 months 24 days
Weighted Average Remaining Contractual Life, Options exercisable at year-end 4 years 4 years 1 month 6 days 4 years 4 months 24 days