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Segment reporting and concentrations (Details 2) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Revenues	$ 15,523	$ 15,135	$ 14,063	$ 13,802	$ 15,892	$ 14,804	$ 14,314	$ 14,066	$ 58,523	$ 59,076	$ 64,249
Other - principally Europe
Segment Reporting Information [Line Items]
Revenues									5,607	5,478	3,616
United States
Segment Reporting Information [Line Items]
Revenues									28,412	31,489	41,616
The Netherlands
Segment Reporting Information [Line Items]
Revenues									9,610	9,870	9,163
United Kingdom
Segment Reporting Information [Line Items]
Revenues									9,070	9,113	8,128
Canada
Segment Reporting Information [Line Items]
Revenues									$ 5,824	$ 3,126	$ 1,726

X

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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- Definition

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+ References

No definition available.

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