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Income taxes (Details Textual) (USD $)	3 Months Ended
Income taxes (Details Textual) (USD $)	Mar. 31, 2013	Mar. 31, 2012
Income Taxes (Textual) [Abstract]
Provision for income taxes	$ 7,000	$ 32,000
Total amount of unrecognized tax benefits	382,000
Total balance of accrued interest and penalties related to uncertain tax positions	$ 211,000
Unrecognized tax benefits to change	12 months

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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- Definition

This element represents the amount of interest expense accrued as of the date of the statement of financial position for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity.

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