Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2022	Jul. 31, 2021	Jul. 31, 2022	Jul. 31, 2021
Net income (loss) per common share:
Net income	$ (870)	$ 2,968	$ 259	$ 7,970
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	7,670,636	7,982,995	7,656,470	7,964,058
Effect of dilutive securities from restricted stock plan and from dilutive effect of stock options		158,112	184,811	156,351
Denominator for diluted net income per share (adjusted weighted average shares)	7,670,636	8,141,107	7,841,281	8,120,409
Basic net income per share	$ (0.11)	$ 0.37	$ 0.03	$ 1.00
Diluted net income per share	$ (0.11)	$ 0.36	$ 0.03	$ 0.98