Net income (loss) per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2021		Jul. 31, 2020
Earnings Per Share [Abstract]
Net income (loss)	$ 3,760	$ 3,553	$ (149)		$ (1,145)
Weighted average shares outstanding - basic (shares)	15,920,000	15,733,000	15,872,000		15,694,000
Net effect of dilutive share-based on the treasury stock method using average market price (shares)	9,000	13,000	0		0
Totals (shares)	15,929,000	15,746,000	15,872,000	[1]	15,694,000	[1]
Net income (loss) per share - basic (usd per share)	$ 0.24	$ 0.23	$ (0.01)		$ (0.07)
Net income (loss) per share - diluted (usd per share)	$ 0.24	$ 0.23	$ (0.01)	[1]	$ (0.07)	[1]
Antidilutive stock options (shares)			1,500		5,000

[1] Net loss per common share was calculated based on basic shares outstanding due to the anti-dilutive effect on the inclusion of common stock equivalent shares.