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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

X

- 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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration