Stock-Based Compensation (Details 1) - Employee Stock Option [Member] - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Summary of the status of the stock option plan and changes
Shares Outstanding at beginning of year	648,311	662,841	642,203
Shares Granted	101,350	94,700	110,950
Shares Exercised	(191,497)	(105,630)	(74,437)
Shares Forfeited or expired	(16,750)	(3,600)	(15,875)
Shares Outstanding at end of year	541,414	648,311	662,841
Shares options exercisable at year-end	305,991	404,851	419,766
Shares available for grant	183,990	270,090	359,690
Weighted average exercise price Outstanding at beginning of year	$ 20.74	$ 15.70	$ 11.77
Weighted average exercise price Granted	32.81	43.13	35.34
Weighted average exercise price Exercised	9.24	8.51	9.48
Weighted average exercise price Forfeited or expired	34.01	40.03	23.49
Weighted average exercise price Outstanding at end of year	26.65	20.74	15.70
Weighted average exercise price, Options exercisable at year-end	20.00	12.58	9.20
Weighted average fair value of options granted during the year	$ 11.81	$ 16.76	$ 14.14
Weighted Average Remaining Contractual Life, Outstanding at end of year	6 years 3 months 19 days	5 years 7 months 6 days	5 years 7 months 6 days
Weighted Average Remaining Contractual Life, Options exercisable at year-end	4 years 10 months 25 days	4 years	4 years 1 month 6 days