Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2019	Jul. 31, 2018
Numerator:
Net income	$ 1,395	$ 1,017	$ 930	$ 2,885
Denominator:
Denominator for basic earnings per share (weighted-average shares which reflect shares in the treasury, 471,289 and 356,441 for July 31, 2019 and 2018, respectively)	8,012,475	8,116,199	8,013,150	8,116,199
Effect of dilutive securities from restricted stock plan and from dilutive effect of stock options	89,867	60,936	83,077	52,559
Denominator for diluted earnings per share (adjusted weighted average shares)	8,102,342	8,177,135	8,096,227	8,168,758
Basic earnings per share	$ 0.17	$ 0.13	$ 0.12	$ 0.36
Diluted earnings per share	$ 0.17	$ 0.12	$ 0.11	$ 0.35
Warrants and restricted stock awards excluded from the computation of diluted loss per share because the effect of inclusion would have been anti-dilutive	.17	.12	.11	.35