Segment Reporting (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016
Segment Reporting Information [Line Items]
Net sales	$ 23,909	$ 22,269	$ 46,870	$ 42,638
Domestic [Member]
Segment Reporting Information [Line Items]
Net sales	$ 12,630	$ 11,790	$ 25,330	$ 23,980
Sales Revenue, Percentage	52.83%	52.94%	54.05%	56.24%
International [Member]
Segment Reporting Information [Line Items]
Net sales	$ 11,280	$ 10,480	$ 21,540	$ 18,660
Sales Revenue, Percentage	47.17%	47.06%	45.95%	43.76%
Sales Revenue, Net [Member]
Segment Reporting Information [Line Items]
Net sales	$ 23,910	$ 22,270	$ 46,870	$ 42,640
Sales Revenue, Percentage	100.00%	100.00%	100.00%	100.00%