Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2018	Oct. 31, 2017
Numerator:
Net income	$ 501	$ 1,806	$ 3,386	$ 5,358
Denominator:
Denominator for basic earnings per share (weighted-average shares which reflect 356,441 shares in the treasury)	8,119,448	7,894,582	8,117,307	7,477,202
Effect of dilutive securities from restricted stock plan and from dilutive effect of stock options	66,682	27,815	57,253	53,435
Denominator for diluted earnings per share (adjusted weighted average shares)	8,186,130	7,922,397	8,174,560	7,530,637
Basic earnings per share	$ 0.06	$ 0.23	$ 0.42	$ 0.72
Diluted earnings per share	$ 0.06	$ 0.23	$ 0.41	$ 0.71