Net Income (Loss) per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017
Earnings Per Share [Abstract]
Net income (loss)	$ 5,475	$ 5,028	$ 1,903	$ 2,817
Weighted average shares outstanding (shares)	15,392	15,211	15,355	15,170
Net effect of dilutive share-based on the treasury stock method using average market price (shares)	43	74	40	63
Totals (shares)	15,435	15,285	15,395	15,233
Net income (loss) per share - basic (usd per share)	$ 0.36	$ 0.33	$ 0.12	$ 0.19
Net income (loss) per share - diluted (usd per share)	$ 0.35	$ 0.33	$ 0.12	$ 0.18