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Revenue from contracts with customers (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Revenue from Contract with Customer [Abstract]
Costs incurred and estimated earnings on uncompleted contracts	$ 6,354	$ 6,342
Billings on uncompleted contracts	(6,825)	(7,868)
Excess of billings over costs incurred and estimated earnings	(471)	(1,526)
Costs and estimated earnings in excess of billings on uncompleted contracts	899	194
Billings in excess of costs and estimated earnings on uncompleted contracts	(1,370)	(1,720)
Net amount of billings in excess of costs and estimated earnings on uncompleted contracts	$ (471)	$ (1,526)

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- Definition

Liability attributable to (i) billings in excess of costs under the percentage of completion contract accounting method representing the difference between contractually invoiced amounts (billings) and revenue recognized based, for example, on costs incurred to estimated total costs at period end or (ii) contractually invoiced amounts (billings) in excess of costs incurred and accumulated under the completed contract accounting method.

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Amount of receivable reflecting the cost incurred on uncompleted contracts in excess of related billings.

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Amount of increase (decrease) in the asset reflecting the cost incurred on uncompleted contracts in excess of related billings.

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