Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2023	Jul. 31, 2022	Jul. 31, 2023	Jul. 31, 2022
Net income (loss) per common share:
Net income	$ 2,465	$ (870)	$ 3,785	$ 259
Denominator for basic net income per share (weighted-average shares which exclude shares in the treasury, 1,353,508 and 964,722 at April 30, 2023 and 2022, respectively	7,409,305	7,670,636	7,340,914	7,656,470
Effect of dilutive securities from restricted stock plan	182,481	0	182,481	184,811
Denominator for diluted net income per share (adjusted weighted average shares)	7,591,786	7,670,636	7,523,395	7,841,281
Basic net income (loss) per share	$ 0.33	$ 0.11	$ 0.52	$ 0.03
Diluted net income (loss) per share	$ 0.32	$ 0.11	$ 0.50	$ 0.03