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Accounts Receivable and Sales Concentrations (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Activity in the allowance for doubtful accounts
Balance at Beginning of Year	$ 438	$ 478	$ 473
Additions	98	140	97
Write-offs	(224)	(178)	(81)
Currency Impacts	(1)	(2)	(11)
Balance at End of Year	$ 311	$ 438	$ 478

Amount of the current period expense charged against operations, the offset which is generally to the allowance for doubtful accounts for the purpose of reducing receivables, including notes receivable, to an amount that approximates their net realizable value (the amount expected to be collected).

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