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Net income (loss) per share applicable to common stockholders (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Numerator:    
Net income (loss) $ 432,117us-gaap_NetIncomeLoss $ (620,493)us-gaap_NetIncomeLoss
Basic 5,005,579us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 4,865,036us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted 5,250,914us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 4,865,036us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Net income (loss) per share:    
Basic $ 0.09us-gaap_EarningsPerShareBasic $ (0.13)us-gaap_EarningsPerShareBasic
Diluted $ 0.08us-gaap_EarningsPerShareDiluted $ (0.13)us-gaap_EarningsPerShareDiluted