7. Income taxes (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Mar. 31, 2014
Income Tax Disclosure [Abstract]
Income Tax Expense (Benefit)	$ 146,000	$ 588,000	$ 361,000	$ 866,000
Effective Income Tax Rate Reconciliation, Percent	45.50%	32.60%	38.80%	26.70%
Unrecognized Tax Benefits that Would Impact Effective Tax Rate					$ 111,000