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8. Income taxes (Detail) (USD $)	3 Months Ended		6 Months Ended
8. Income taxes (Detail) (USD $)	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Income Tax Expense (Benefit)	$ 286,000	$ 777,000	$ 966,000	$ 1,759,000
Effective Income Tax Rate, Continuing Operations	36.00%	35.00%	36.00%	35.00%
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 228,000		$ 228,000

- Definition

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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