Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2022	Oct. 31, 2021	Oct. 31, 2022	Oct. 31, 2021
Net income per common share:
Net income	$ 1,431	$ 2,896	$ 1,690	$ 10,866
Denominator for basic net income (loss) per share (weighted-average shares which exclude shares in the treasury, 1,133,097 and 736,696 at July 31, 2022 and 2021, respectively	7,514,725	7,849,591	7,600,272	7,942,162
Effect of dilutive securities from restricted stock plan and from dilutive effect of stock options	189,970	149,374	187,390	147,613
Denominator for diluted net income per share (adjusted weighted average shares)	7,704,695	7,998,965	7,787,662	8,089,775
Basic net income per share	$ 0.19	$ 0.37	$ 0.22	$ 1.37
Diluted net income per share	$ 0.19	$ 0.36	$ 0.22	$ 1.34