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Risks and uncertainties (Details)	Dec. 31, 2018 USD ($) shares
A/F Protein, Inc.
Concentration Risk [Line Items]
Shares of common stock included in other assets (in shares) | shares	216,281
Ownership percent, less than	1.00%
Cost basis of shares of common stock of A/F Protein	$ 21,628
Canada | Cash | Credit Concentration Risk
Concentration Risk [Line Items]
Cash in Canadian bank accounts	$ 230,677

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