Income per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Numerator:
Net income	$ 659	$ 6,130	$ 698	$ 7,085
Denominator:
Weighted average common shares outstanding	5,306	5,252	5,290	5,240
Dilutive potential common shares	5	18	16	19
Shares used in diluted net income per common share calculations	5,311	5,270	5,306	5,259
Basic net income per common share	$ 0.12	$ 1.17	$ 0.13	$ 1.35
Diluted net income per common share	$ 0.12	$ 1.16	$ 0.13	$ 1.35
Shares excluded from diluted weighted shares outstanding	15,000	5,000	15,000	11,000