Net Income Per Share (Schedule of Weighted Average Number of Shares) (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended				6 Months Ended
		Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Basic net income per share
Net Income		$ 2,115	$ 1,246	$ 1,832	$ 2,796	$ 3,361	$ 4,628
Weighted Average Shares	[1]	2,688,005		2,666,120		2,683,122	2,663,842
Per Share Amount	[1]	$ 0.79		$ 0.69		$ 1.25	$ 1.74
Effect of dilutive stock options		960		22,225		4,269	21,862
Effect of dilutive stock options, Per Share Amount				$ (0.01)			$ (0.02)
Diluted net income per share
Net Income		$ 2,115	$ 1,246	$ 1,832	$ 2,796	$ 3,361	$ 4,628
Weighted Average Shares	[1]	2,688,965		2,688,345		2,687,391	2,685,704
Per Share Amount	[1]	$ 0.79		$ 0.68		$ 1.25	$ 1.72

[1] Share data has been retroactively adjusted to reflect the 5% stock dividend effective July 5, 2019.