Income (loss) per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Numerator:
Net income	$ 752	$ 150	$ 1,883	$ 39
Denominator:
Weighted average common shares outstanding	5,341,000	5,296,000	5,332,000	5,281,000
Dilutive potential common shares	9,000	3,000	11,000	18,000
Shares used in diluted net income per common share calculations	5,350,000	5,299,000	5,343,000	5,299,000
Basic net income per common share	$ 0.14	$ 0.03	$ 0.35	$ 0.01
Diluted net income per common share	$ 0.14	$ 0.03	$ 0.35	$ 0.01
Shares excluded from diluted weighted shares outstanding	2,000	15,000	2,000	5,000