Concentration (Details Textual) - Sales Revenue, Net [Member]	3 Months Ended		9 Months Ended
	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2016	Oct. 31, 2015
Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration Risk, Customer	No customer accounted for more than 10% of net sales	No customer accounted for more than 10% of net sales	No customer accounted for more than 10% of net sales	No customer accounted for more than 10% of net sales
Supplier Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration Risk, Supplier	No supplier accounted for more than 10% of net sales	No supplier accounted for more than 10% of net sales	No supplier accounted for more than 10% of net sales	No supplier accounted for more than 10% of net sales