13. Income taxes (Details) - Income Tax Provision Components (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current:
Federal	$ 176	$ 1,479	$ 1,973
State	15	38	46
Foreign	12	33	40
	203us-gaap_CurrentIncomeTaxExpenseBenefit	1,550us-gaap_CurrentIncomeTaxExpenseBenefit	2,059us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:
Federal	(1,653)	80	(116)
State	17	(34)	21
	(1,636)	46	(95)
Income tax (benefit) provision	$ (1,433)us-gaap_IncomeTaxExpenseBenefit	$ 1,596us-gaap_IncomeTaxExpenseBenefit	$ 1,964us-gaap_IncomeTaxExpenseBenefit

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Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

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Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations.

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The increase (decrease) during the reporting period in the account that represents the temporary difference that results from Income or Loss that is recognized for accounting purposes but not for tax purposes and vice versa.

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