Percentage of voting equity interests acquired at the acquisition date in the business combination.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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- Definition

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

+ 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=98514028&loc=d3e3602-108585

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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Segment information (Details Textual) - USD ($)	12 Months Ended
Segment information (Details Textual) - USD ($)	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Feb. 11, 2016
Aerex Industries Inc [Member]
Segment Reporting Information [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired				51.00%
Retail [Member]
Segment Reporting Information [Line Items]
Depreciation, Depletion and Amortization	$ 2,008,992	$ 2,468,846	$ 2,344,315
Bulk [Member]
Segment Reporting Information [Line Items]
Depreciation, Depletion and Amortization	3,814,444	3,288,083	3,389,717
Services [Member]
Segment Reporting Information [Line Items]
Depreciation, Depletion and Amortization	44,934	116,151	$ 102,901
Manufacturing Units [Member]
Segment Reporting Information [Line Items]
Depreciation, Depletion and Amortization	$ 1,603,971	$ 1,548,188