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Segment information (Details Textual) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Retail [Member]
       
Segment Reporting Information [Line Items]        
Depreciation, Amortization and Accretion, Net, Total $ 592,261 $ 536,229 $ 1,823,757 $ 1,555,128
Bulk [Member]
       
Segment Reporting Information [Line Items]        
Depreciation, Amortization and Accretion, Net, Total 738,405 805,641 2,215,141 2,337,766
Services [Member]
       
Segment Reporting Information [Line Items]        
Depreciation, Amortization and Accretion, Net, Total $ 22,474 $ 73,181 $ 79,922 $ 219,544