Net Income (Loss) per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016
Earnings Per Share [Abstract]
Net income (loss)	$ 5,028	$ 6,886	$ 2,817	$ 3,747
Weighted average shares outstanding (shares)	15,211	15,036	15,170	15,004
Net effect of dilutive share-based on the treasury stock method using average market price (shares)	74	111	63	96
Totals (shares)	15,285	15,147	15,233	15,100
Net income (loss) per share - basic (usd per share)	$ 0.33	$ 0.46	$ 0.19	$ 0.25
Net income (loss) per share - diluted (usd per share)	$ 0.33	$ 0.45	$ 0.18	$ 0.25