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Segment information (Details Textual) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Retail [Member] |  |  |  |
Depreciation, Amortization and Accretion, Net | $ 536,229 | $ 524,401 | $ 1,555,128 | $ 1,576,626
Bulk [Member] |  |  |  |
Depreciation, Amortization and Accretion, Net | 805,641 | 1,291,550 | 2,337,766 | 3,845,642
Services [Member] |  |  |  |
Depreciation, Amortization and Accretion, Net | $ 73,181 | $ 73,280 | $ 219,544 | $ 207,338

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- Definition The aggregate net amount of depreciation, amortization, and accretion recognized during an accounting period. As a noncash item, the net amount is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
Name: | us-gaap_DepreciationAmortizationAndAccretionNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration