Fair value of financial instruments (Details) (USD $)	9 Months Ended
	Oct. 31, 2014 Rate
Notional value Denmark swap	$ 1,300,000
Interest rate swap, maturity date	Dec. 31, 2021
swap fixed interest rate	2.47%
Fair Value, Inputs, Level 2 [Member]
Swap mark to market other long-term liability	$ 97,000