Income per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Numerator:
Net income	$ 6,130	$ 851	$ 7,085	$ 1,345
Denominator:
Weighted average common shares outstanding	5,252,000	5,212,000	5,240,000	5,200,000
Dilutive potential common shares	18,000	32,000	19,000	6,000
Shares used in diluted net income per common share calculations	5,270,000	5,244,000	5,259,000	5,206,000
Basic net income per common share	$ 1.17	$ 0.16	$ 1.35	$ 0.26
Diluted net income per common share	$ 1.16	$ 0.16	$ 1.35	$ 0.26
Shares excluded from diluted weighted shares outstanding	5,000	22,065	11,000	64,041