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Related Party Transactions - Marine (Details) - Marine Products - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 31, 2015
Related party transactions: |  |  |  |
Ownership percentage | 100.00% |  |  | 50.00%
Transition Support Services Agreement [Member] |  |  |  |
Related party transactions: |  |  |  |
Related party charges | $ 846,000 | $ 865,000 | $ 873,000 |
Due from related party, current | $ 49,000 | $ 55,000 |  |

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