Concentration of Risk (Details Textual) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jan. 31, 2017
UNITED STATES
Concentration Risk [Line Items]
Interest-bearing Deposits in Banks and Other Financial Institutions	$ 1.5		$ 1.4
Foreign Countries [Member]
Concentration Risk [Line Items]
Interest-bearing Deposits in Banks and Other Financial Institutions	$ 11.7		$ 9.0
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
Supplier Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration Risk, Supplier	No supplier accounted for more than 10% of net purchases	No supplier accounted for more than 10% of net purchases