Income (Loss) per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Numerator:
Net income (loss)	$ (111)	$ 308
Denominator:
Weighted average common shares outstanding	5,267,000	5,224,000
Dilutive potential common shares	0	19,000
Shares used in diluted net income (loss) per common share calculations	5,267,000	5,243,000
Basic net income (loss) per common share	$ (0.02)	$ 0.06
Diluted net income (loss) per common share	$ (0.02)	$ 0.06
Shares excluded from diluted weighted shares outstanding	27,139	23,000