Net Income (Loss) per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2019	Jul. 31, 2018
Earnings Per Share [Abstract]
Net income (loss)	$ 5,867	$ 5,475	$ 2,800	$ 1,903
Weighted average shares outstanding (shares)	15,561	15,392	15,524	15,355
Net effect of dilutive share-based on the treasury stock method using average market price (shares)	7	43	5	40
Totals (shares)	15,568	15,435	15,529	15,395
Net income (loss) per share - basic (usd per share)	$ 0.38	$ 0.36	$ 0.18	$ 0.12
Net income (loss) per share - diluted (usd per share)	$ 0.38	$ 0.35	$ 0.18	$ 0.12