Long-term contracts (Costs Incurred on Contracts) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Long-Term Contracts Costs Incurred On Contracts Details
Costs and estimated earnings incurred on uncompleted contracts	$ 1,977	$ 1,822
Billings on uncompleted contracts	(2,063)	(1,908)
Net of costs and billings on uncompleted contracts	(86)	(86)
Costs and estimated earnings in excess of billings on uncompleted contracts	12	70
Billings in excess of costs and estimated earnings on uncompleted contracts	(98)	(156)
Net of costs and billings on uncompleted contracts	$ (86)	$ (86)

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 that are expected to be realized within one year or one operating cycle, whichever is longer, from the reporting date.

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Amount included in cost of uncompleted contracts in excess of related billings, or unbilled accounts receivable, which is expected to be collected within a year within one year (or one operating cycle, if longer) from the date of the balance sheet.

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