Note 9 - Earnings Per Share - Summary of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Oct. 31, 2022	Jul. 31, 2022	Apr. 30, 2022	Oct. 31, 2021	Jul. 31, 2021	Apr. 30, 2021	Oct. 31, 2022	Oct. 31, 2021
Basic (in shares)	8,004			8,126			8,096	8,148
Dilutive effect of equity compensation plans (in shares)	142			267			142	260
Weighted average common shares outstanding assuming full dilution (in shares)	8,146			8,393			8,238	8,408
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)	105			60			105	66
Stock options and restricted stock with exercise prices or grant date prices below the average market prices (in shares)	142			267			142	260
Net income (loss)	$ 1,728	$ 1,868	$ (885)	$ 495	$ 3,416	$ (843)	$ 2,711	$ 3,068
Basic (in dollars per share)	$ 0.22			$ 0.06			$ 0.33	$ 0.38
Diluted (in dollars per share)	$ 0.21			$ 0.06			$ 0.33	$ 0.36