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Significant accounting policies Cash and cash equivalents (Details) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2013
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 10,508	$ 13,395	$ 7,034
United States
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	739
Middle East [Member]
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 9,769

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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