Note 8 - Earnings Per Share - Summary of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jul. 31, 2022	Apr. 30, 2022	Jul. 31, 2021	Apr. 30, 2021	Jul. 31, 2022	Jul. 31, 2021
Basic (in shares)	7,975		8,151		7,947	8,158
Dilutive effect of equity compensation plans (in shares)	211		170		115	132
Weighted average common shares outstanding assuming full dilution (in shares)	8,186		8,321		8,062	8,290
Stock options and restricted stock not included in the computation of diluted earnings per share of common stock because the option exercise prices or grant date prices exceeded the average market prices of the common shares (in shares)	19		166		115	203
Stock options and restricted stock with exercise prices or grant date prices below the average market prices (in shares)	211		170		115	132
Net income (loss)	$ 1,868	$ (885)	$ 3,416	$ (843)	$ 983	$ 2,573
Basic (in dollars per share)	$ 0.23		$ 0.42		$ 0.12	$ 0.32
Diluted (in dollars per share)	$ 0.23		$ 0.41		$ 0.12	$ 0.31