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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 |

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