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Segment information (Details Textual) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Retail [Member]
       
Segment Reporting Information [Line Items]        
Depreciation, Amortization and Accretion, Net, Total $ 598,223 $ 508,259 $ 1,231,496 $ 1,018,899
Bulk [Member]
       
Segment Reporting Information [Line Items]        
Depreciation, Amortization and Accretion, Net, Total 735,672 767,609 1,476,736 1,532,125
Services [Member]
       
Segment Reporting Information [Line Items]        
Depreciation, Amortization and Accretion, Net, Total $ 22,474 $ 73,182 $ 57,448 $ 146,363