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Segment reporting and concentrations (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Revenues	$ 60,929	$ 63,074
Other - principally Europe
Segment Reporting Information [Line Items]
Revenues	7,773	7,555
United States
Segment Reporting Information [Line Items]
Revenues	30,135	32,070
The Netherlands
Segment Reporting Information [Line Items]
Revenues	6,871	9,216
United Kingdom
Segment Reporting Information [Line Items]
Revenues	10,514	8,271
Canada
Segment Reporting Information [Line Items]
Revenues	$ 5,636	$ 5,962

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=63488584&loc=d3e20235-122688

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Details

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