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Property, plant and equipment - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Construction in process	$ 26,505,903	$ 25,973,037
Capital Additions | Rollo Bay farm site
Property, Plant and Equipment [Line Items]
Amount committed to renovations	828,000
Construction in process
Property, Plant and Equipment [Line Items]
Construction in process	6,545,566	$ 6,091,265
Construction in process | Rollo Bay farm site
Property, Plant and Equipment [Line Items]
Construction in process	$ 6,000,000

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The minimum amount the entity agreed to spend under the long-term purchase commitment.

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- Definition

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
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-Name Accounting Standards Codification
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-Section S99
-Paragraph 1
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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.

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