Deferred income tax assets (Details Textual) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Deferred Tax Assets [Line Items]
Deferred Tax Assets, Valuation Allowance	$ 9,395	$ 9,236
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent	5,458	4,896
Current deferred tax assets	7,334	$ 7,078
U.S [Member]
Deferred Tax Assets [Line Items]
Deferred Tax Assets, Valuation Allowance	$ 7,300
Amortizing Period Of Net Operating Loss	20 years
Non U.S [Member]
Deferred Tax Assets [Line Items]
Deferred Tax Assets, Valuation Allowance	$ 2,100
Amortizing Period Of Net Operating Loss	5 years