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Reconciliation of income taxes (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Reconciliation of income taxes    
Tax at statutory rate of 25% $ (4,736,660) $ 1,400,395
Current and prior years 8,534 149,644
Effect of tax holiday 1,834,517 (655,947)
Other, primarily the effect of US tax rates 0 (70,471)
Change in valuation allowance Reconciliation 3,955,022 160,300
Income tax expense Reconciliation $ 1,061,413 $ 983,921