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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