Summary of Business and Significant Accounting Policies (Computation of Basic and Diluted Loss Per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Jan. 31, 2023	Jan. 31, 2022
Accounting Policies [Abstract]
Net income (loss)	$ 16,547	$ (15,136)
Weighted-average shares — basic	16,142,000	15,954,000
Dilutive effect of common stock equivalents from equity incentive plans	50,000	0
Weighted-average shares — diluted	16,192,000	15,954,000
Basic	$ 1.03	$ (0.95)
Diluted	$ 1.02	$ (0.95)
Shares of common stock equivalents excluded from computation of diluted net income per share (in shares)	0	96,000