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Segment information (Details Textual) (USD $)
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Retail [Member]
   
Segment Reporting Information [Line Items]    
Depreciation, Amortization and Accretion, Net, Total $ 633,273 $ 510,640
Bulk [Member]
   
Segment Reporting Information [Line Items]    
Depreciation, Amortization and Accretion, Net, Total 741,063 764,516
Services [Member]
   
Segment Reporting Information [Line Items]    
Depreciation, Amortization and Accretion, Net, Total $ 34,974 $ 73,181