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Risks and uncertainties (Details) | Dec. 31, 2018 USD ($) shares
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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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