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Segment information (Details Textual) - USD ($) | 12 Months Ended |
--- | --- | ---
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 |  |

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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References 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 + Details
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Period Type: | instant

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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 + Details
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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. + Details
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- Details
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- Details
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- Details
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- Details
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- Details
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