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Income taxes (Details) (USD $)	12 Months Ended
Income taxes (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Summary of provision for income taxes
Federal - current	$ 799,264	$ 1,011,543
Federal - deferred	(333)	9,842
State - current	17,835	33,398
State - deferred	(954)	295
Total provision for income taxes	$ 815,812	$ 1,055,078

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

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

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

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