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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2020
Jan. 01, 2019
Dreyfus Government Cash Management money market, included in cash equivalents   $ 80,000,000  
Assets held for sale $ 248,000    
Asset impairment expense 150,000    
Lease liability 415,094 352,810 $ 532,000
Right of use assets 399,477 341,997 $ 512,000
Weighted Average [Member]      
Discount rate     8.00%
Trademarks [Member]      
Impairment loss 90,000    
Long-Term Equity Holding [Member]      
Impairment loss 13,000    
General And Administrative Expenses [Member]      
Impairment loss $ 103,000    
Conventional Salmon Biomass [Member]      
Net realizable value   0  
AquAdvantage Salmon Biomass [Member]      
Net realizable value   $ 1,200,000