Income (loss) per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Numerator:
Net income	$ 613	$ 659	$ 2,496	$ 698
Denominator:
Weighted average common shares outstanding	5,349,000	5,306,000	5,338,000	5,290,000
Dilutive potential common shares	12,000	5,000	13,000	16,000
Shares used in diluted net income per common share calculations	5,361,000	5,311,000	5,351,000	5,306,000
Basic net income per common share	$ 0.11	$ 0.12	$ 0.47	$ 0.13
Diluted net income per common share	$ 0.11	$ 0.12	$ 0.47	$ 0.13
Shares excluded from diluted weighted shares outstanding	2,000	15,000	2,000	15,000