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Risks and Uncertainties (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
A/F Protein, Inc. [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Common stock included in other assets (in shares) | 216,281 |  |
Ownership percent, less than | 1.00% |  |
Long-term Investments |  | $ 9 | $ 22
Canada [Member] | Cash [Member] | Credit Concentration Risk [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Cash in Canadian bank accounts | $ 242 |  |

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