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Related Party Transactions (Details) - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Related Party Transactions (Textual)      
Sales to the affiliated companies $ 651,000 $ 752,000  
Charges to the affiliated companies for services 197,000 155,000  
Receivables due from affiliated companies 1,196,000   $ 962,000
Reimburse business related expenditures 30,000 32,000  
Insurance Broker [Member]      
Related Party Transactions (Textual)      
Insurance premiums paid 257,000 225,000  
Service [Member]      
Related Party Transactions (Textual)      
Paid to an affiliated company 21,000 27,000  
Charter boat services 9,000 16,500  
Research and development costs $ 12,000 $ 10,500