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7. Income taxes (Details) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended
7. Income taxes (Details) (USD $)	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Dec. 31, 2010
Income Tax Disclosure [Abstract]
Income Tax Reconciliation, Change in Enacted Tax Rate			$ 7
Income Tax Expense (Benefit)	434,000	13,000	1,300,000	979,000
Effective Income Tax Rate, Continuing Operations	23.00%	36.10%	25.40%	36.00%
Unrecognized Tax Benefits, Decreases Resulting from Prior Period Tax Positions						224,000
Income Tax Reconciliation, Tax Credits, Research					220,000	(9)
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 73,000		$ 73,000

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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- Definition

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

The portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations, that is attributable to changes in the income tax rates under enacted tax laws in the period.

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