Net Income per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015
Earnings Per Share [Abstract]
Net income	$ 6,886	$ 7,450	$ 3,747	$ 4,274
Weighted average shares outstanding	15,036	14,887	15,004	14,856
Net effect of dilutive share-based on the treasury stock method using average market price	111	289	96	283
Totals	15,147	15,176	15,100	15,139
Net income per share - basic	$ 0.46	$ 0.50	$ 0.25	$ 0.29
Net income per share - diluted	$ 0.45	$ 0.49	$ 0.25	$ 0.28