Net Income (Loss) per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2020	Jul. 31, 2019
Earnings Per Share [Abstract]
Net income (loss)	$ 3,553	$ 5,867	$ (1,145)	$ 2,800
Weighted average shares outstanding - basic (shares)	15,733,000	15,561,000	15,694,000	15,524,000
Net effect of dilutive share-based on the treasury stock method using average market price (shares)	13,000	7,000	0	5,000
Totals (shares)	15,746,000	15,568,000	15,694,000	15,529,000
Net income (loss) per share - basic (usd per share)	$ 0.23	$ 0.38	$ (0.07)	$ 0.18
Net income (loss) per share - diluted (usd per share)	$ 0.23	$ 0.38	$ (0.07)	$ 0.18
Antidilutive stock options (shares)			5,000