Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017
Numerator:
Net income	$ 1,017	$ 1,842	$ 2,885	$ 3,552
Denominator:
Denominator for basic earnings per share (weighted-average shares which reflect 356,441 shares in the treasury)	8,116,199	7,266,291	8,116,199	7,265,053
Effect of dilutive securities from restricted stock plan and from dilutive effect of stock options	60,936	13,759	52,559	51,823
Denominator for diluted earnings per share (adjusted weighted average shares)	8,177,135	7,280,050	8,168,758	7,316,876
Basic earnings per share	$ 0.13	$ 0.25	$ 0.36	$ 0.49
Diluted earnings per share	$ 0.12	$ 0.25	$ 0.35	$ 0.49