Segment information (Details Textual) - Continuing Operations [Member] - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Retail [Member]
Segment Reporting Information [Line Items]
Depreciation, Depletion and Amortization	$ 488,895	$ 483,009	$ 975,133	$ 995,552
Bulk [Member]
Segment Reporting Information [Line Items]
Depreciation, Depletion and Amortization	827,037	841,184	1,653,816	1,668,573
Services [Member]
Segment Reporting Information [Line Items]
Depreciation, Depletion and Amortization	7,638	29,038	29,657	58,076
Manufacturing [Member]
Segment Reporting Information [Line Items]
Depreciation, Depletion and Amortization	$ 399,455	$ 493,270	$ 805,945	$ 703,939