Restricted cash (Tables)

3 Months Ended

Apr. 30, 2017

Restricted Cash and Cash Equivalents Items [Line Items]

Schedule of Restricted Cash and Cash Equivalents [Table Text Block]

Restricted cash. Restricted cash held by foreign subsidiaries was $1.1 million as of April 30, 2017 and January 31, 2017. Restricted cash held by foreign subsidiaries related to an escrow account from the sale of Nordic Air Filtration and fixed deposits that also serve as security deposits and guarantees.

	Three Months Ended April 30,
	2017		2016
Cash and cash equivalents		$9,059		$12,858
Restricted cash	1,140		944
Cash, cash equivalents and restricted cash shown in the statement of cashflows		$10,199		$13,802