Segment information - Additional Information (Details) - USD ($)	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Retail [Member]
Segment Reporting Information [Line Items]
Depreciation, Depletion and Amortization	$ 2,364,994	$ 2,019,462
Bulk [Member]
Segment Reporting Information [Line Items]
Depreciation, Depletion and Amortization	3,795,320	3,387,592
Services [Member]
Segment Reporting Information [Line Items]
Depreciation, Depletion and Amortization	125,306	28,386
Manufacturing Units [Member]
Segment Reporting Information [Line Items]
Depreciation, Depletion and Amortization	$ 922,027	$ 1,598,794

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

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