Stock Compensation Plan - Schedule of Stock Option Plans and Changes in Stock Options (Details) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Granted, Shares	605,000	576,000	527,000
Stock Options [Member]
Outstanding at beginning of year, Shares	1,778,100	1,760,000	1,560,500
Granted, Shares	605,000	576,000	527,000
Exercised, Shares	(128,500)	(547,900)	(277,500)
Forfeited, shares	(2,000)	(10,000)	0
Expired, Shares	0	0	(50,000)
Outstanding at end of year, Shares	2,252,600	1,778,100	1,760,000
Options exercisable at end of year	1,647,600	1,202,100	1,233,000
Outstanding at beginning of year, Weighted Average Exercise Price	$ 11.60	$ 9.97	$ 9.92
Weighted Average Exercise Price, Granted	13.26	14.96	9.77
Weighted Average Exercise Price, Exercised	10.78	9.92	8.96
Weighted Average Exercise Price, Forfeited	12.41	9.77	0
Weighted Average Exercise Price, Expired	0	0	11.97
Outstanding at end of year, Weighted Average Exercise Price	12.09	11.60	9.97
Weighted average fair value of options granted during the year	$ 2.05	$ 1.81	$ 0.81